{"id":"CVE-2026-20271","aliases":["EUVD-2026-53457","GHSA-g2mx-jm98-x82v"],"status":"published","title":"Cisco IOS XE Software Security Hardening Release","description":"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 software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.\r\n\u0026nbsp;","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00467,"percentile":0.40723,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-691"],"published":"2026-08-05T16:19:22Z","modified":"2026-10-23T21:10:00Z","products":[{"vendor":"cisco","product":"cisco ios xe software"},{"vendor":"cisco","product":"ios_xe"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ","tags":["Vendor Advisory"]},{"url":"https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20271"},{"url":"https://github.com/advisories/GHSA-g2mx-jm98-x82v"}],"sources":{"cve":[{"id":"CVE-2026-20271","title":"Cisco IOS XE Software Security Hardening Release","description":"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 software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.\r\n\u0026nbsp;","status":"published","published":"2026-08-05T16:19:22.991Z","modified":"2026-10-02T23:23:02.176Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-691"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-53457","description":"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 software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.\r\n\u0026nbsp;","status":"published","published":"2026-08-05T16:19:22Z","modified":"2026-10-02T23:23:02Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T17:27:41.962371Z"}],"ghsa":[{"id":"GHSA-g2mx-jm98-x82v","title":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE...","description":"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 software hardening releases that address multiple internally discovered vulnerabilities.\n\nThe vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.\n\u0026nbsp;","status":"published","published":"2026-08-05T18:31:38Z","modified":"2026-08-14T21:31:14Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-691"],"updated_at":"2026-11-02T15:10:29.313415Z"}],"nvd":[{"id":"CVE-2026-20271","description":"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 software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.\r\n\u0026nbsp;","status":"published","published":"2026-08-05T17:16:48.81Z","modified":"2026-10-23T21:10:00.157Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-691"],"updated_at":"2026-11-02T14:12:35.031043Z"}]}}