{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-20311", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-20311", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-09-24T17:12:06.928Z", "updatedAt": "2025-09-30T14:28:26.310Z", "importedAt": "2026-10-24T01:57:24.991Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": null, "summary": "A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic.\r\n\r This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition.", "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", "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": "16.12.14", "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": "17.3.4b", "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": "17.11.1", "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": "17.12.1z3", "status": "affected" }, { "version": "17.13.1", "status": "affected" }, { "version": "17.14.1", "status": "affected" }, { "version": "17.11.99SW", "status": "affected" }, { "version": "17.15.1", "status": "affected" }, { "version": "17.15.2", "status": "affected" }, { "version": "17.15.2a", "status": "affected" }, { "version": "17.15.2b", "status": "affected" }, { "version": "17.16.1", "status": "affected" } ] } ] } } }