{"id":"CVE-2026-20283","title":"A vulnerability in the IPsec Open API endpoint of Cisco ISE could allow an authenticated, remote attacker to inject arbitrary commands on the underlying operating system. \r\n\r\nThis vulnerability is due to insufficient validation of u…","summary":"A vulnerability in the IPsec Open API endpoint of Cisco ISE could allow an authenticated, remote attacker to inject arbitrary commands on the underlying operating system. \r\n\r\nThis vulnerability is due to insufficient validation of u…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-78"],"vendor":"Cisco","product":"Cisco Identity Services Engine Software","affected":["identity_services_engine_software 3.3.0","identity_services_engine_software 3.3 Patch 2","identity_services_engine_software 3.3 Patch 1","identity_services_engine_software 3.3 Patch 3","identity_services_engine_software 3.4.0","identity_services_engine_software 3.3 Patch 4","identity_services_engine_software 3.4 Patch 1","identity_services_engine_software 3.3 Patch 5","identity_services_engine_software 3.3 Patch 6","identity_services_engine_software 3.4 Patch 2","identity_services_engine_software 3.3 Patch 7","identity_services_engine_software 3.4 Patch 3","identity_services_engine_software 3.5.0","identity_services_engine_software 3.4 Patch 4","identity_services_engine_software 3.3 Patch 8","identity_services_engine_software 3.5 Patch 1","identity_services_engine_software 3.3 Patch 9","identity_services_engine_software 3.4 Patch 5","identity_services_engine_software 3.5 Patch 3","identity_services_engine_software 3.5 Patch 2","identity_services_engine_software 3.3 Patch 10","identity_services_engine_software 3.3 Patch 11","identity_services_engine_software 3.4 Patch 6"],"published":"2026-09-16","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:28:28.567","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20283","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-mult-vul-ymSsTLCc","label":"psirt@cisco.com"},{"url":"https://software.cisco.com"}],"tags":["nvd","cve.org","csaf","vendor-advisory","cisco"],"epss":0.00434,"epssPercentile":0.37102,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-17T03:57:40.682633Z"},"ingestedAt":"2026-09-16T16:37:52.198Z","slug":"CVE-2026-20283","body":"## Overview\n\nA vulnerability in the IPsec Open API endpoint of Cisco ISE could allow an authenticated, remote attacker to inject arbitrary commands on the underlying operating system. \r\n\r\nThis vulnerability is due to insufficient validation of user-supplied input in IPsec Open API calls. An attacker could exploit this vulnerability by sending crafted input to the IPsec Open API endpoint on an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system. \r\nTo exploit this vulnerability, the attacker must have valid administrative credentials and the node must have more than one network interface, one of which must be configured as an active IPsec tunnel.\r\nNote: For CVE-2026-20283, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **cisco-sa-ise-mult-vul-ymSsTLCc** · Cisco · affected: Cisco Identity Services Engine Software (23 versions) · updated 2026-09-16 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-mult-vul-ymSsTLCc)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}