CVE-2026-20028

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20028", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.352Z", "datePublished": "2026-08-05T16:18:08.371Z", "dateUpdated": "2026-08-05T17:19:46.116Z"}, "containers": {"cna": {"title": "Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N", "baseScore": 5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}}], "descriptions": [{"lang": "en", "value": "A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.\r\n\r\nThis vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ts-agent-fw-bypass-MYBTMrev", "name": "cisco-sa-ts-agent-fw-bypass-MYBTMrev"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-ts-agent-fw-bypass-MYBTMrev", "discovery": "EXTERNAL", "defects": ["CSCws82513"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Incorrect Privilege Assignment", "type": "cwe", "cweId": "CWE-266"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Terminal Services Agent", "versions": [{"version": "TSAgent-1.3", "status": "affected"}, {"version": "TSAgent-1.4.2", "status": "affected"}, {"version": "TSAgent-1.2", "status": "affected"}, {"version": "TSAgent-1.4", "status": "affected"}, {"version": "TSAgent-1.0", "status": "affected"}, {"version": "TSAgent-1.4.1", "status": "affected"}, {"version": "TSAgent-1.1", "status": "affected"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-08-05T16:18:08.371Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-05T17:19:39.672252Z", "id": "CVE-2026-20028", "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": "2026-08-05T17:19:46.116Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20028", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.352Z", "datePublished": "2026-08-05T16:18:08.371Z", "dateUpdated": "2026-08-05T17:19:46.116Z"}, "containers": {"cna": {"title": "Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N", "baseScore": 5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}}], "descriptions": [{"lang": "en", "value": "A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.\r\n\r\nThis vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ts-agent-fw-bypass-MYBTMrev", "name": "cisco-sa-ts-agent-fw-bypass-MYBTMrev"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-ts-agent-fw-bypass-MYBTMrev", "discovery": "EXTERNAL", "defects": ["CSCws82513"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Incorrect Privilege Assignment", "type": "cwe", "cweId": "CWE-266"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Terminal Services Agent", "versions": [{"version": "TSAgent-1.3", "status": "affected"}, {"version": "TSAgent-1.4.2", "status": "affected"}, {"version": "TSAgent-1.2", "status": "affected"}, {"version": "TSAgent-1.4", "status": "affected"}, {"version": "TSAgent-1.0", "status": "affected"}, {"version": "TSAgent-1.4.1", "status": "affected"}, {"version": "TSAgent-1.1", "status": "affected"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-08-05T16:18:08.371Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-20028", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-05T17:19:39.672252Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-05T17:19:43.317Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Cisco Terminal Services Agent", "vendor": "Cisco", "versions": [{"status": "affected", "version": "TSAgent-1.3"}, {"status": "affected", "version": "TSAgent-1.4.2"}, {"status": "affected", "version": "TSAgent-1.2"}, {"status": "affected", "version": "TSAgent-1.4"}, {"status": "affected", "version": "TSAgent-1.0"}, {"status": "affected", "version": "TSAgent-1.4.1"}, {"status": "affected", "version": "TSAgent-1.1"}]}], "source": "psirt@cisco.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.\r\n\r\nThis vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system."}, {"lang": "es", "value": "Una vulnerabilidad en el controlador de red de Cisco Terminal Service (TS) Agent podr\u00eda permitir a un atacante remoto y autenticado eludir las reglas del cortafuegos que est\u00e1n asociadas con la cuenta del atacante.\n\nEsta vulnerabilidad se debe a una asignaci\u00f3n incorrecta de las conexiones de red a las cuentas de usuario. Un atacante con credenciales de al menos nivel de usuario podr\u00eda explotar esta vulnerabilidad enviando tr\u00e1fico de red manipulado a un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante heredar las reglas del cortafuegos asociadas con un usuario diferente en el sistema."}], "id": "CVE-2026-20028", "lastModified": "2026-10-23T21:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 1.4, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20028", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T17:19:39.672252Z", "version": "2.0.3"}}]}, "published": "2026-08-05T17:16:46.427", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ts-agent-fw-bypass-MYBTMrev"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-266"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.4.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.4.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "TSAgent-1.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Cisco Terminal Services Agent", "source": "cna", "vendor": "Cisco"}, "product": "cisco_terminal_services_agent", "vendor": "cisco"}], "created": "2026-08-05T19:00:05.192747+00:00", "updated": "2026-08-07T10:05:58.027575+00:00", "vendors": ["cisco", "cisco$PRODUCT$cisco_terminal_services_agent"]}