{"id":"CVE-2026-20273","title":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review","summary":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cwe":["CWE-20"],"published":"2026-08-05","updated":"2026-08-14","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20273","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ","label":"psirt@cisco.com"},{"url":"https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://software.cisco.com"}],"tags":["nvd","csaf","vendor-advisory","cisco"],"epss":0.00277,"epssPercentile":0.20341,"ingestedAt":"2026-08-15T17:27:28.041Z","vendor":"Cisco","product":"Cisco IOS XE Software","affected":["ios_xe_software 3.2.0SG","ios_xe_software 3.2.1SG","ios_xe_software 3.7.0S","ios_xe_software 3.7.1S","ios_xe_software 3.3.0SG","ios_xe_software 3.7.2S","ios_xe_software 3.7.3S","ios_xe_software 3.7.4S","ios_xe_software 3.8.0S","ios_xe_software 3.8.1S","ios_xe_software 3.8.2S","ios_xe_software 3.9.1S","ios_xe_software 3.9.0S","ios_xe_software 3.2.0SE","ios_xe_software 3.3.0SE","ios_xe_software 3.2.1SE","ios_xe_software 3.2.2SE","ios_xe_software 3.2.3SE","ios_xe_software 3.2.2SG","ios_xe_software 3.2.3SG","ios_xe_software 3.2.4SG","ios_xe_software 3.2.5SG","ios_xe_software 3.3.2SG","ios_xe_software 3.4.0SG","ios_xe_software 3.4.2SG","ios_xe_software 3.3.1SG","ios_xe_software 3.4.1SG","ios_xe_software 3.3.1SE","ios_xe_software 3.5.0E","ios_xe_software 3.10.0S","ios_xe_software 3.10.1S","ios_xe_software 3.10.2S","ios_xe_software 3.10.0aS","ios_xe_software 3.11.1S","ios_xe_software 3.12.0S","ios_xe_software 3.11.2S","ios_xe_software 3.13.0S","ios_xe_software 3.10.3S","ios_xe_software 3.10.4S","ios_xe_software 3.7.5S"],"slug":"CVE-2026-20273","body":"## Overview\n\nAs part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.\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-hardening-iosxe-V8NMuMZJ** · Cisco · affected: Cisco IOS XE Software (595 versions) · updated 2026-08-05 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}