CVE-2026-20004

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20004", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.349Z", "datePublished": "2026-03-25T16:04:48.379Z", "dateUpdated": "2026-03-26T17:38:43.815Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-25T16:04:48.379Z"}, "descriptions": [{"lang": "en", "value": "A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.\r\n\r This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition."}], "affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"version": "16.9.1", "status": "affected"}, {"version": "16.9.2", "status": "affected"}, {"version": "16.9.1a", "status": "affected"}, {"version": "16.9.1b", "status": "affected"}, {"version": "16.9.1s", "status": "affected"}, {"version": "16.9.3", "status": "affected"}, {"version": "16.9.4", "status": "affected"}, {"version": "16.9.3a", "status": "affected"}, {"version": "16.9.5", "status": "affected"}, {"version": "16.9.5f", "status": "affected"}, {"version": "16.9.6", "status": "affected"}, {"version": "16.9.7", "status": "affected"}, {"version": "16.9.8", "status": "affected"}, {"version": "16.10.1", "status": "affected"}, {"version": "16.10.1a", "status": "affected"}, {"version": "16.10.1b", "status": "affected"}, {"version": "16.10.1s", "status": "affected"}, {"version": "16.10.1c", "status": "affected"}, {"version": "16.10.1e", "status": "affected"}, {"version": "16.10.1d", "status": "affected"}, {"version": "16.10.2", "status": "affected"}, {"version": "16.10.1f", "status": "affected"}, {"version": "16.10.1g", "status": "affected"}, {"version": "16.10.3", "status": "affected"}, {"version": "16.11.1", "status": "affected"}, {"version": "16.11.1a", "status": "affected"}, {"version": "16.11.1b", "status": "affected"}, {"version": "16.11.2", "status": "affected"}, {"version": "16.11.1s", "status": "affected"}, {"version": "16.12.1", "status": "affected"}, {"version": "16.12.1s", "status": "affected"}, {"version": "16.12.1a", "status": "affected"}, {"version": "16.12.1c", "status": "affected"}, {"version": "16.12.1w", "status": "affected"}, {"version": "16.12.2", "status": "affected"}, {"version": "16.12.1y", "status": "affected"}, {"version": "16.12.2a", "status": "affected"}, {"version": "16.12.3", "status": "affected"}, {"version": "16.12.8", "status": "affected"}, {"version": "16.12.2s", "status": "affected"}, {"version": "16.12.1x", "status": "affected"}, {"version": "16.12.1t", "status": "affected"}, {"version": "16.12.4", "status": "affected"}, {"version": "16.12.3s", "status": "affected"}, {"version": "16.12.3a", "status": "affected"}, {"version": "16.12.4a", "status": "affected"}, {"version": "16.12.5", "status": "affected"}, {"version": "16.12.6", "status": "affected"}, {"version": "16.12.1z1", "status": "affected"}, {"version": "16.12.5a", "status": "affected"}, {"version": "16.12.5b", "status": "affected"}, {"version": "16.12.1z2", "status": "affected"}, {"version": "16.12.6a", "status": "affected"}, {"version": "16.12.7", "status": "affected"}, {"version": "16.12.9", "status": "affected"}, {"version": "16.12.10", "status": "affected"}, {"version": "16.12.10a", "status": "affected"}, {"version": "16.12.11", "status": "affected"}, {"version": "16.12.12", "status": "affected"}, {"version": "16.12.13", "status": "affected"}, {"version": "16.12.14", "status": "affected"}, {"version": "16.12.15", "status": "affected"}, {"version": "17.1.1", "status": "affected"}, {"version": "17.1.1a", "status": "affected"}, {"version": "17.1.1s", "status": "affected"}, {"version": "17.1.1t", "status": "affected"}, {"version": "17.1.3", "status": "affected"}, {"version": "17.2.1", "status": "affected"}, {"version": "17.2.1r", "status": "affected"}, {"version": "17.2.1a", "status": "affected"}, {"version": "17.2.1v", "status": "affected"}, {"version": "17.2.2", "status": "affected"}, {"version": "17.2.3", "status": "affected"}, {"version": "17.3.1", "status": "affected"}, {"version": "17.3.2", "status": "affected"}, {"version": "17.3.3", "status": "affected"}, {"version": "17.3.1a", "status": "affected"}, {"version": "17.3.1w", "status": "affected"}, {"version": "17.3.2a", "status": "affected"}, {"version": "17.3.1x", "status": "affected"}, {"version": "17.3.1z", "status": "affected"}, {"version": "17.3.4", "status": "affected"}, {"version": "17.3.5", "status": "affected"}, {"version": "17.3.4a", "status": "affected"}, {"version": "17.3.6", "status": "affected"}, {"version": "17.3.4b", "status": "affected"}, {"version": "17.3.4c", "status": "affected"}, {"version": "17.3.5a", "status": "affected"}, {"version": "17.3.5b", "status": "affected"}, {"version": "17.3.7", "status": "affected"}, {"version": "17.3.8", "status": "affected"}, {"version": "17.3.8a", "status": "affected"}, {"version": "17.4.1", "status": "affected"}, {"version": "17.4.2", "status": "affected"}, {"version": "17.4.1a", "status": "affected"}, {"version": "17.4.1b", "status": "affected"}, {"version": "17.4.2a", "status": "affected"}, {"version": "17.5.1", "status": "affected"}, {"version": "17.5.1a", "status": "affected"}, {"version": "17.6.1", "status": "affected"}, {"version": "17.6.2", "status": "affected"}, {"version": "17.6.1w", "status": "affected"}, {"version": "17.6.1a", "status": "affected"}, {"version": "17.6.1x", "status": "affected"}, {"version": "17.6.3", "status": "affected"}, {"version": "17.6.1y", "status": "affected"}, {"version": "17.6.1z", "status": "affected"}, {"version": "17.6.3a", "status": "affected"}, {"version": "17.6.4", "status": "affected"}, {"version": "17.6.1z1", "status": "affected"}, {"version": "17.6.5", "status": "affected"}, {"version": "17.6.6", "status": "affected"}, {"version": "17.6.6a", "status": "affected"}, {"version": "17.6.5a", "status": "affected"}, {"version": "17.6.7", "status": "affected"}, {"version": "17.6.8", "status": "affected"}, {"version": "17.6.8a", "status": "affected"}, {"version": "17.7.1", "status": "affected"}, {"version": "17.7.1a", "status": "affected"}, {"version": "17.7.1b", "status": "affected"}, {"version": "17.7.2", "status": "affected"}, {"version": "17.10.1", "status": "affected"}, {"version": "17.10.1a", "status": "affected"}, {"version": "17.10.1b", "status": "affected"}, {"version": "17.8.1", "status": "affected"}, {"version": "17.8.1a", "status": "affected"}, {"version": "17.9.1", "status": "affected"}, {"version": "17.9.1w", "status": "affected"}, {"version": "17.9.2", "status": "affected"}, {"version": "17.9.1a", "status": "affected"}, {"version": "17.9.1x", "status": "affected"}, {"version": "17.9.1y", "status": "affected"}, {"version": "17.9.3", "status": "affected"}, {"version": "17.9.2a", "status": "affected"}, {"version": "17.9.1x1", "status": "affected"}, {"version": "17.9.3a", "status": "affected"}, {"version": "17.9.4", "status": "affected"}, {"version": "17.9.1y1", "status": "affected"}, {"version": "17.9.5", "status": "affected"}, {"version": "17.9.4a", "status": "affected"}, {"version": "17.9.5a", "status": "affected"}, {"version": "17.9.5b", "status": "affected"}, {"version": "17.9.6", "status": "affected"}, {"version": "17.9.6a", "status": "affected"}, {"version": "17.9.5e", "status": "affected"}, {"version": "17.9.5f", "status": "affected"}, {"version": "17.11.1", "status": "affected"}, {"version": "17.11.1a", "status": "affected"}, {"version": "17.12.1", "status": "affected"}, {"version": "17.12.1w", "status": "affected"}, {"version": "17.12.1a", "status": "affected"}, {"version": "17.12.1x", "status": "affected"}, {"version": "17.12.2", "status": "affected"}, {"version": "17.12.3", "status": "affected"}, {"version": "17.12.2a", "status": "affected"}, {"version": "17.12.1y", "status": "affected"}, {"version": "17.12.1z", "status": "affected"}, {"version": "17.12.4", "status": "affected"}, {"version": "17.12.3a", "status": "affected"}, {"version": "17.12.1z1", "status": "affected"}, {"version": "17.12.1z2", "status": "affected"}, {"version": "17.12.4a", "status": "affected"}, {"version": "17.12.4b", "status": "affected"}, {"version": "17.12.1z3", "status": "affected"}, {"version": "17.12.1z4", "status": "affected"}, {"version": "17.12.1z5", "status": "affected"}, {"version": "17.12.1z6", "status": "affected"}, {"version": "17.13.1", "status": "affected"}, {"version": "17.13.1a", "status": "affected"}, {"version": "17.14.1", "status": "affected"}, {"version": "17.14.1a", "status": "affected"}, {"version": "17.15.1", "status": "affected"}, {"version": "17.15.1w", "status": "affected"}, {"version": "17.15.1a", "status": "affected"}, {"version": "17.15.1b", "status": "affected"}, {"version": "17.15.1x", "status": "affected"}, {"version": "17.15.1z", "status": "affected"}, {"version": "17.15.1y", "status": "affected"}, {"version": "17.16.1", "status": "affected"}, {"version": "17.16.1a", "status": "affected"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Missing Reference to Active Allocated Resource", "type": "cwe", "cweId": "CWE-771"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-tls-dos-TVgLDEZL", "name": "cisco-sa-iosxe-tls-dos-TVgLDEZL"}], "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}}], "exploits": [{"lang": "en", "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-iosxe-tls-dos-TVgLDEZL", "discovery": "EXTERNAL", "defects": ["CSCwm80596", "CSCwk59707"]}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-26T17:38:35.255782Z", "id": "CVE-2026-20004", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-26T17:38:43.815Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-20004", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-26T17:38:35.255782Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-26T17:38:39.794Z"}}], "cna": {"source": {"defects": ["CSCwm80596", "CSCwk59707"], "advisory": "cisco-sa-iosxe-tls-dos-TVgLDEZL", "discovery": "EXTERNAL"}, "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"status": "affected", "version": "16.9.1"}, {"status": "affected", "version": "16.9.2"}, {"status": "affected", "version": "16.9.1a"}, {"status": "affected", "version": "16.9.1b"}, {"status": "affected", "version": "16.9.1s"}, {"status": "affected", "version": "16.9.3"}, {"status": "affected", "version": "16.9.4"}, {"status": "affected", "version": "16.9.3a"}, {"status": "affected", "version": "16.9.5"}, {"status": "affected", "version": "16.9.5f"}, {"status": "affected", "version": "16.9.6"}, {"status": "affected", "version": "16.9.7"}, {"status": "affected", "version": "16.9.8"}, {"status": "affected", "version": "16.10.1"}, {"status": "affected", "version": "16.10.1a"}, {"status": "affected", "version": "16.10.1b"}, {"status": "affected", "version": "16.10.1s"}, {"status": "affected", "version": "16.10.1c"}, {"status": "affected", "version": "16.10.1e"}, {"status": "affected", "version": "16.10.1d"}, {"status": "affected", "version": "16.10.2"}, {"status": "affected", "version": "16.10.1f"}, {"status": "affected", "version": "16.10.1g"}, {"status": "affected", "version": "16.10.3"}, {"status": "affected", "version": "16.11.1"}, {"status": "affected", "version": "16.11.1a"}, {"status": "affected", "version": "16.11.1b"}, {"status": "affected", "version": "16.11.2"}, {"status": "affected", "version": "16.11.1s"}, {"status": "affected", "version": "16.12.1"}, {"status": "affected", "version": "16.12.1s"}, {"status": "affected", "version": "16.12.1a"}, {"status": "affected", "version": "16.12.1c"}, {"status": "affected", "version": "16.12.1w"}, {"status": "affected", "version": "16.12.2"}, {"status": "affected", "version": "16.12.1y"}, {"status": "affected", "version": "16.12.2a"}, {"status": "affected", "version": "16.12.3"}, {"status": "affected", "version": "16.12.8"}, {"status": "affected", "version": "16.12.2s"}, {"status": "affected", "version": "16.12.1x"}, {"status": "affected", "version": "16.12.1t"}, {"status": "affected", "version": "16.12.4"}, {"status": "affected", "version": "16.12.3s"}, {"status": "affected", "version": "16.12.3a"}, {"status": "affected", "version": "16.12.4a"}, {"status": "affected", "version": "16.12.5"}, {"status": "affected", "version": "16.12.6"}, {"status": "affected", "version": "16.12.1z1"}, {"status": "affected", "version": "16.12.5a"}, {"status": "affected", "version": "16.12.5b"}, {"status": "affected", "version": "16.12.1z2"}, {"status": "affected", "version": "16.12.6a"}, {"status": "affected", "version": "16.12.7"}, {"status": "affected", "version": "16.12.9"}, {"status": "affected", "version": "16.12.10"}, {"status": "affected", "version": "16.12.10a"}, {"status": "affected", "version": "16.12.11"}, {"status": "affected", "version": "16.12.12"}, {"status": "affected", "version": "16.12.13"}, {"status": "affected", "version": "16.12.14"}, {"status": "affected", "version": "16.12.15"}, {"status": "affected", "version": "17.1.1"}, {"status": "affected", "version": "17.1.1a"}, {"status": "affected", "version": "17.1.1s"}, {"status": "affected", "version": "17.1.1t"}, {"status": "affected", "version": "17.1.3"}, {"status": "affected", "version": "17.2.1"}, {"status": "affected", "version": "17.2.1r"}, {"status": "affected", "version": "17.2.1a"}, {"status": "affected", "version": "17.2.1v"}, {"status": "affected", "version": "17.2.2"}, {"status": "affected", "version": "17.2.3"}, {"status": "affected", "version": "17.3.1"}, {"status": "affected", "version": "17.3.2"}, {"status": "affected", "version": "17.3.3"}, {"status": "affected", "version": "17.3.1a"}, {"status": "affected", "version": "17.3.1w"}, {"status": "affected", "version": "17.3.2a"}, {"status": "affected", "version": "17.3.1x"}, {"status": "affected", "version": "17.3.1z"}, {"status": "affected", "version": "17.3.4"}, {"status": "affected", "version": "17.3.5"}, {"status": "affected", 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"affected", "version": "17.6.1y"}, {"status": "affected", "version": "17.6.1z"}, {"status": "affected", "version": "17.6.3a"}, {"status": "affected", "version": "17.6.4"}, {"status": "affected", "version": "17.6.1z1"}, {"status": "affected", "version": "17.6.5"}, {"status": "affected", "version": "17.6.6"}, {"status": "affected", "version": "17.6.6a"}, {"status": "affected", "version": "17.6.5a"}, {"status": "affected", "version": "17.6.7"}, {"status": "affected", "version": "17.6.8"}, {"status": "affected", "version": "17.6.8a"}, {"status": "affected", "version": "17.7.1"}, {"status": "affected", "version": "17.7.1a"}, {"status": "affected", "version": "17.7.1b"}, {"status": "affected", "version": "17.7.2"}, {"status": "affected", "version": "17.10.1"}, {"status": "affected", "version": "17.10.1a"}, {"status": "affected", "version": "17.10.1b"}, {"status": "affected", "version": "17.8.1"}, {"status": "affected", "version": "17.8.1a"}, {"status": "affected", "version": "17.9.1"}, {"status": "affected", "version": "17.9.1w"}, {"status": "affected", "version": "17.9.2"}, {"status": "affected", "version": "17.9.1a"}, {"status": "affected", "version": "17.9.1x"}, {"status": "affected", "version": "17.9.1y"}, {"status": "affected", "version": "17.9.3"}, {"status": "affected", "version": "17.9.2a"}, {"status": "affected", "version": "17.9.1x1"}, {"status": "affected", "version": "17.9.3a"}, {"status": "affected", "version": "17.9.4"}, {"status": "affected", "version": "17.9.1y1"}, {"status": "affected", "version": "17.9.5"}, {"status": "affected", "version": "17.9.4a"}, {"status": "affected", "version": "17.9.5a"}, {"status": "affected", "version": "17.9.5b"}, {"status": "affected", "version": "17.9.6"}, {"status": "affected", "version": "17.9.6a"}, {"status": "affected", "version": "17.9.5e"}, {"status": "affected", "version": "17.9.5f"}, {"status": "affected", "version": "17.11.1"}, {"status": "affected", "version": "17.11.1a"}, {"status": "affected", "version": "17.12.1"}, {"status": "affected", "version": "17.12.1w"}, {"status": "affected", "version": "17.12.1a"}, {"status": "affected", "version": "17.12.1x"}, {"status": "affected", "version": "17.12.2"}, {"status": "affected", "version": "17.12.3"}, {"status": "affected", "version": "17.12.2a"}, {"status": "affected", "version": "17.12.1y"}, {"status": "affected", "version": "17.12.1z"}, {"status": "affected", "version": "17.12.4"}, {"status": "affected", "version": "17.12.3a"}, {"status": "affected", "version": "17.12.1z1"}, {"status": "affected", "version": "17.12.1z2"}, {"status": "affected", "version": "17.12.4a"}, {"status": "affected", "version": "17.12.4b"}, {"status": "affected", "version": "17.12.1z3"}, {"status": "affected", "version": "17.12.1z4"}, {"status": "affected", "version": "17.12.1z5"}, {"status": "affected", "version": "17.12.1z6"}, {"status": "affected", "version": "17.13.1"}, {"status": "affected", "version": "17.13.1a"}, {"status": "affected", "version": "17.14.1"}, {"status": "affected", "version": "17.14.1a"}, {"status": "affected", "version": "17.15.1"}, {"status": "affected", "version": "17.15.1w"}, {"status": "affected", "version": "17.15.1a"}, {"status": "affected", "version": "17.15.1b"}, {"status": "affected", "version": "17.15.1x"}, {"status": "affected", "version": "17.15.1z"}, {"status": "affected", "version": "17.15.1y"}, {"status": "affected", "version": "17.16.1"}, {"status": "affected", "version": "17.16.1a"}]}], "exploits": [{"lang": "en", "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-tls-dos-TVgLDEZL", "name": "cisco-sa-iosxe-tls-dos-TVgLDEZL"}], "descriptions": [{"lang": "en", "value": "A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.\r\n\r This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-771", "description": "Missing Reference to Active Allocated Resource"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-25T16:04:48.379Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20004", "state": "PUBLISHED", "dateUpdated": "2026-03-26T17:38:43.815Z", "dateReserved": "2025-10-08T11:59:15.349Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-03-25T16:04:48.379Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition."}, {"lang": "es", "value": "Una vulnerabilidad en la biblioteca TLS del software Cisco IOS XE podr\u00eda permitir a un atacante adyacente no autenticado agotar la memoria disponible de un dispositivo afectado. Esta vulnerabilidad se debe a una gesti\u00f3n inadecuada de los recursos de memoria durante la configuraci\u00f3n de la conexi\u00f3n TLS. Un atacante podr\u00eda explotar esta vulnerabilidad desencadenando repetidamente las condiciones que causan el aumento de memoria. Esto podr\u00eda hacerse de varias maneras, como intentando repetidamente la autenticaci\u00f3n del Protocolo de Autenticaci\u00f3n Extensible (EAP) cuando el EAP local est\u00e1 habilitado en un dispositivo afectado o utilizando un ataque de intermediario y restableciendo las conexiones TLS entre el dispositivo afectado y otros dispositivos. Un exploit exitoso podr\u00eda permitir al atacante agotar la memoria disponible en un dispositivo afectado, lo que resultar\u00eda en una recarga inesperada y una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."}], "id": "CVE-2026-20004", "lastModified": "2026-09-28T15:18:43.007", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20004", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-26T17:38:35.255782Z", "version": "2.0.3"}}]}, "published": "2026-03-25T16:16:10.520", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-tls-dos-TVgLDEZL"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-771"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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"affected", "versions": {"scheme": "generic", "value": "17.12.1z4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.1z5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.1z6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.13.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.13.1a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.14.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.14.1a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.15.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1w"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1x"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1z"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.1y"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.16.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.16.1a"}}], "enrichment": {"confidence": 88.0, "confidence_source": "matching", "scores": [{"score": 88.0, "source": "matching"}]}, "original": {"product": "Cisco IOS XE Software", "source": "cna", "vendor": "Cisco"}, "product": "ios_xe_software", "vendor": "cisco"}], "analysis": {"en": {"generated_at": "2026-03-25T19:34:00.112901+00:00", "value": {"mitigation_remediation": ["Apply the latest Cisco IOS XE Software patch that fixes the TLS memory management issue", "Disable local EAP authentication if it is not required for your deployment", "Monitor device memory usage and reload events to detect early signs of the issue", "Check Cisco\u2019s security advisory page for any additional mitigations or updates"], "summary": {"action": "Patch", "impact": "Denial of Service caused by memory exhaustion in the TLS library"}, "threat_synthesis": {"affected_systems": "The affected product is Cisco IOS XE Software. No specific version information is provided in the data, so all releases of the CISCO IOS XE platform that include the vulnerable TLS library are potentially affected. Attacks are typically launched from an adjacent network or via a man\u2011in\u2011the\u2011middle position that can reset TLS connections.", "description_and_impact": "The vulnerability allows an unauthenticated attacker to exhaust the device\u2019s memory by repeatedly creating TLS connections, such as through repeated EAP authentication attempts or a machine\u2011in\u2011the\u2011middle resetting TLS sessions. This improper memory resource handling can cause the device to reload unexpectedly, resulting in a denial of service. The weakness falls under resource exhaustion and is identified as CWE\u2011771, leading to loss of availability for the affected system.", "risk_and_exploitability": "The CVSS score of 7.4 indicates a high severity level, and while EPSS data is not available, the lack of authentication requirement and the possibility of an attacker on the same network make exploitation plausible. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is an unauthenticated adjacent attacker that can trigger TLS or EAP traffic to a device, or an attacker able to perform a MITM reset of TLS sessions. Successful exploitation would cause a memory leak, leading to a reload and device downtime."}}}}, "created": "2026-03-25T21:30:53.626330+00:00", "title": "TLS Memory Exhaustion in Cisco IOS XE Software Causing Denial of Service", "updated": "2026-03-26T11:42:46.017294+00:00", "vendors": ["cisco", "cisco$PRODUCT$ios_xe_software"]}