CVE-2026-20084

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A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."}], "affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"version": "16.6.1", "status": "affected"}, {"version": "16.6.2", "status": "affected"}, {"version": "16.6.3", "status": "affected"}, {"version": "16.6.4", "status": "affected"}, {"version": "16.6.5", "status": "affected"}, {"version": "16.6.4a", "status": "affected"}, {"version": "16.6.6", "status": "affected"}, {"version": "16.6.7", "status": "affected"}, {"version": "16.6.8", "status": "affected"}, {"version": "16.6.9", "status": "affected"}, {"version": "16.6.10", "status": "affected"}, {"version": "16.7.1", "status": "affected"}, {"version": "16.8.1", "status": "affected"}, {"version": "16.8.1a", 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"16.12.8", "status": "affected"}, {"version": "16.12.2s", "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": "16.12.5b", "status": "affected"}, {"version": "16.12.6a", "status": "affected"}, {"version": "16.12.7", "status": "affected"}, {"version": "17.1.1", "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": "17.2.1a", "status": "affected"}, {"version": "17.3.1", "status": "affected"}, {"version": "17.3.2", "status": "affected"}, {"version": "17.3.3", "status": "affected"}, {"version": "17.3.2a", "status": "affected"}, {"version": "17.3.4", "status": "affected"}, 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{"version": "17.9.1", "status": "affected"}, {"version": "17.9.2", "status": "affected"}, {"version": "17.9.3", "status": "affected"}, {"version": "17.9.4", "status": "affected"}, {"version": "17.9.5", "status": "affected"}, {"version": "17.9.4a", "status": "affected"}, {"version": "17.9.6", "status": "affected"}, {"version": "17.9.6a", "status": "affected"}, {"version": "17.9.7", "status": "affected"}, {"version": "17.9.8", "status": "affected"}, {"version": "17.11.1", "status": "affected"}, {"version": "17.12.1", "status": "affected"}, {"version": "17.12.2", "status": "affected"}, {"version": "17.12.3", "status": "affected"}, {"version": "17.12.4", "status": "affected"}, {"version": "17.12.5", "status": "affected"}, {"version": "17.12.1z5", "status": "affected"}, {"version": "17.13.1", "status": "affected"}, {"version": "17.14.1", "status": "affected"}, {"version": "17.15.1", "status": "affected"}, {"version": "17.15.2", "status": "affected"}, {"version": "17.15.3", "status": "affected"}, {"version": "17.15.2b", "status": "affected"}, {"version": "17.15.4", "status": "affected"}, {"version": "17.15.4d", "status": "affected"}, {"version": "17.16.1", "status": "affected"}, {"version": "17.17.1", "status": "affected"}, {"version": "17.18.1", "status": "affected"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Uncontrolled Resource Consumption", "type": "cwe", "cweId": "CWE-400"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA", "name": "cisco-sa-bootp-WuBhNBxA"}], "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "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-bootp-WuBhNBxA", "discovery": "EXTERNAL", "defects": ["CSCwq07617"]}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-26T17:35:41.843290Z", "id": "CVE-2026-20084", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-03-26T17:35:50.008Z"}}]}}

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"affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"status": "affected", "version": "16.6.1"}, {"status": "affected", "version": "16.6.2"}, {"status": "affected", "version": "16.6.3"}, {"status": "affected", "version": "16.6.4"}, {"status": "affected", "version": "16.6.5"}, {"status": "affected", "version": "16.6.4a"}, {"status": "affected", "version": "16.6.6"}, {"status": "affected", "version": "16.6.7"}, {"status": "affected", "version": "16.6.8"}, {"status": "affected", "version": "16.6.9"}, {"status": "affected", "version": "16.6.10"}, {"status": "affected", "version": "16.7.1"}, {"status": "affected", "version": "16.8.1"}, {"status": "affected", "version": "16.8.1a"}, {"status": "affected", "version": "16.8.1s"}, {"status": "affected", "version": "16.9.1"}, {"status": "affected", "version": "16.9.2"}, {"status": "affected", "version": "16.9.1s"}, {"status": "affected", "version": "16.9.3"}, {"status": "affected", "version": "16.9.4"}, {"status": "affected", "version": "16.9.5"}, {"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": "16.10.1s"}, {"status": "affected", "version": "16.10.1e"}, {"status": "affected", "version": "16.11.1"}, {"status": "affected", "version": "16.11.1b"}, {"status": "affected", "version": "16.11.1s"}, {"status": "affected", "version": "16.12.1"}, {"status": "affected", "version": "16.12.1s"}, {"status": "affected", "version": "16.12.1c"}, {"status": "affected", "version": "16.12.2"}, {"status": "affected", "version": "16.12.3"}, {"status": "affected", "version": "16.12.8"}, {"status": "affected", "version": "16.12.2s"}, {"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": "16.12.5b"}, {"status": "affected", "version": "16.12.6a"}, {"status": "affected", "version": "16.12.7"}, {"status": "affected", "version": "17.1.1"}, {"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": "17.2.1a"}, {"status": "affected", "version": "17.3.1"}, {"status": "affected", "version": "17.3.2"}, {"status": "affected", "version": "17.3.3"}, {"status": "affected", "version": "17.3.2a"}, {"status": "affected", "version": "17.3.4"}, {"status": "affected", "version": "17.3.5"}, {"status": "affected", "version": "17.3.6"}, {"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": "17.5.1"}, {"status": "affected", "version": "17.6.1"}, {"status": "affected", "version": "17.6.2"}, {"status": "affected", "version": "17.6.3"}, {"status": "affected", "version": "17.6.1y"}, {"status": "affected", "version": "17.6.4"}, {"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": "17.7.1"}, {"status": "affected", "version": "17.10.1"}, {"status": "affected", "version": "17.10.1b"}, {"status": "affected", "version": "17.8.1"}, {"status": "affected", "version": "17.9.1"}, {"status": "affected", "version": "17.9.2"}, {"status": "affected", "version": "17.9.3"}, {"status": "affected", "version": "17.9.4"}, {"status": "affected", "version": "17.9.5"}, {"status": "affected", "version": "17.9.4a"}, {"status": "affected", "version": "17.9.6"}, {"status": "affected", "version": "17.9.6a"}, {"status": "affected", "version": "17.9.7"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.11.1"}, {"status": "affected", "version": "17.12.1"}, {"status": "affected", "version": "17.12.2"}, {"status": "affected", "version": "17.12.3"}, {"status": "affected", "version": "17.12.4"}, {"status": "affected", "version": "17.12.5"}, {"status": "affected", "version": "17.12.1z5"}, {"status": "affected", "version": "17.13.1"}, {"status": "affected", "version": "17.14.1"}, {"status": "affected", "version": "17.15.1"}, {"status": "affected", "version": "17.15.2"}, {"status": "affected", "version": "17.15.3"}, {"status": "affected", "version": "17.15.2b"}, {"status": "affected", "version": "17.15.4"}, {"status": "affected", "version": "17.15.4d"}, {"status": "affected", "version": "17.16.1"}, {"status": "affected", "version": "17.17.1"}, {"status": "affected", "version": "17.18.1"}]}], "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-bootp-WuBhNBxA", "name": "cisco-sa-bootp-WuBhNBxA"}], "descriptions": [{"lang": "en", "value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-400", "description": "Uncontrolled Resource Consumption"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-25T16:02:39.119Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20084", "state": "PUBLISHED", "dateUpdated": "2026-03-26T17:35:50.008Z", "dateReserved": "2025-10-08T11:59:15.366Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-03-25T16:02:39.119Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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"88707E5B-2040-40AB-A8D2-39D6B97E40B1", "vulnerable": true}, {"criteria": "cpe:2.3:o:cisco:ios_xe:17.17.1:*:*:*:*:*:*:*", "matchCriteriaId": "A9F98075-6210-4332-B76E-ECDFF1D55D33", "vulnerable": true}, {"criteria": "cpe:2.3:o:cisco:ios_xe:17.18.1:*:*:*:*:*:*:*", "matchCriteriaId": "1A57F16D-2020-46F1-BA1A-DAE484F31920", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."}, {"lang": "es", "value": "Una vulnerabilidad en la caracter\u00edstica de DHCP snooping del software Cisco IOS XE podr\u00eda permitir a un atacante remoto no autenticado causar que los paquetes BOOTP sean reenviados entre VLANs, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a un manejo inadecuado de los paquetes BOOTP en los switches Cisco Catalyst de la serie 9000. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes de solicitud BOOTP a un dispositivo afectado. Un exploit exitoso podr\u00eda permitir a un atacante reenviar paquetes BOOTP de una VLAN a otra, resultando en una fuga de VLAN BOOTP y potencialmente llevando a una alta utilizaci\u00f3n de la CPU. Esto hace que el dispositivo sea inalcanzable (ya sea a trav\u00e9s de la consola o la gesti\u00f3n remota) e incapaz de reenviar tr\u00e1fico, resultando en una condici\u00f3n de DoS. Nota: Esta vulnerabilidad puede ser explotada con paquetes BOOTP unicast o broadcast. Existen soluciones alternativas que abordan esta vulnerabilidad."}], "id": "CVE-2026-20084", "lastModified": "2026-09-28T15:18:38.520", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20084", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-26T17:35:41.843290Z", "version": "2.0.3"}}]}, "published": "2026-03-25T16:16:13.563", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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{"scheme": "generic", "value": "17.15.4d"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.16.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.17.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "17.18.1"}}], "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": "2026-03-25T19:35:33.074754+00:00", "value": {"mitigation_remediation": ["Check Cisco for a firmware or software update that addresses the DHCP snooping flaw and apply it as soon as possible", "If no patch is available, disable the DHCP snooping feature or restrict BOOTP packet forwarding between VLANs to prevent leakage", "Apply network segmentation to limit the reach of any BOOTP packets and monitor CPU usage to detect potential DoS attacks"], "summary": {"action": "Apply Patch", "impact": "Denial of Service via BOOTP VLAN leakage"}, "threat_synthesis": {"affected_systems": "Affected devices include Cisco Catalyst 9000 Series Switches running Cisco IOS XE Software; specific model and version ranges are not listed in the advisory.", "description_and_impact": "The vulnerability lies in the DHCP snooping feature of Cisco IOS XE Software, where BOOTP packets are incorrectly routed between VLANs. This allows remote attackers to send BOOTP requests that cause packet leakage across VLAN boundaries, leading to excessive CPU usage and rendering the device unreachable through console or management interfaces. The weakness is a resource exhaustion flaw.", "risk_and_exploitability": "The CVSS base score of 8.6 denotes a high impact. Exploitation requires an attacker with network access to send unicast or broadcast BOOTP packets, a scenario easily achievable in a LAN environment. Given the lack of an EPSS score and the absence in the KEV catalog, the vulnerability remains high risk without an available patch, necessitating immediate defensive actions."}}}}, "created": "2026-03-25T21:30:58.236586+00:00", "title": "Bootp VLAN Leakage in Cisco IOS XE DHCP Snooping Leading to Denial of Service", "updated": "2026-03-26T11:42:50.051712+00:00", "vendors": ["cisco", "cisco$PRODUCT$ios_xe_software"]}