{ "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-2025-20241", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-20241", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-08-27T16:23:55.242Z", "updatedAt": "2025-08-27T18:18:32.250Z", "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": "Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol Denial of Service Vulnerability", "summary": "A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) feature of Cisco NX-OS Software for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload.\r\n\r\nThis vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause the unexpected restart of the IS-IS process, which could cause the affected device to reload, resulting in a denial of service (DoS) condition.\r\nNote: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device.", "affected": [ { "vendor": "Cisco", "product": "Cisco NX-OS Software", "defaultStatus": "unknown", "versions": [ { "version": "9.2(3)", "status": "affected" }, { "version": "7.0(3)I5(2)", "status": "affected" }, { "version": "6.0(2)A8(7a)", "status": "affected" }, { "version": "7.0(3)I4(5)", "status": "affected" }, { "version": "7.0(3)I4(6)", "status": "affected" }, { "version": "7.0(3)I4(3)", "status": "affected" }, { "version": "9.2(2v)", "status": "affected" }, { "version": "7.0(3)I4(7)", "status": "affected" }, { "version": "7.0(3)I4(1)", "status": "affected" }, { "version": "7.0(3)I4(8)", "status": "affected" }, { "version": "7.0(3)I4(2)", "status": "affected" }, { "version": "6.0(2)A8(11)", "status": "affected" }, { "version": "9.2(1)", "status": "affected" }, { "version": "9.2(2t)", "status": "affected" }, { "version": "9.2(3y)", "status": "affected" }, { "version": "7.0(3)I4(1t)", "status": "affected" }, { "version": "7.0(3)I7(6z)", "status": "affected" }, { "version": "9.3(2)", "status": "affected" }, { "version": "7.0(3)F3(3)", "status": "affected" }, { "version": "7.0(3)I7(3z)", "status": "affected" }, { "version": "7.0(3)IM7(2)", "status": "affected" }, { "version": "6.0(2)A8(11b)", "status": "affected" }, { "version": "7.0(3)I7(5a)", "status": "affected" }, { "version": "7.0(3)I6(1)", "status": "affected" }, { "version": "7.0(3)I5(3b)", "status": "affected" }, { "version": "9.2(4)", "status": "affected" }, { "version": "6.0(2)A8(10)", "status": "affected" }, { "version": "6.0(2)A8(2)", "status": "affected" }, { "version": "7.0(3)IC4(4)", "status": "affected" }, { "version": "7.0(3)F3(3c)", "status": "affected" }, { "version": "7.0(3)F3(1)", "status": "affected" }, { "version": "7.0(3)F3(5)", "status": "affected" }, { "version": "7.0(3)I7(2)", "status": "affected" }, { "version": "7.0(3)I5(3)", "status": "affected" }, { "version": "7.0(3)I7(3)", "status": "affected" }, { "version": "6.0(2)A8(6)", "status": "affected" }, { "version": "7.0(3)I6(2)", "status": "affected" }, { "version": "6.0(2)A8(5)", "status": "affected" }, { "version": "9.3(1)", "status": "affected" }, { "version": "6.0(2)A8(7)", "status": "affected" }, { "version": "7.0(3)I7(6)", "status": "affected" }, { "version": "6.0(2)A8(11a)", "status": "affected" }, { "version": "7.0(3)I4(8z)", "status": "affected" }, { "version": "7.0(3)I4(9)", "status": "affected" }, { "version": "7.0(3)I7(4)", "status": "affected" }, { "version": "7.0(3)I7(7)", "status": "affected" }, { "version": "6.0(2)A8(9)", "status": "affected" }, { "version": "6.0(2)A8(1)", "status": "affected" }, { "version": "6.0(2)A8(10a)", "status": "affected" }, { "version": "7.0(3)I5(1)", "status": "affected" }, { "version": "9.3(1z)", "status": "affected" }, { "version": "9.2(2)", "status": "affected" }, { "version": "7.0(3)F3(4)", "status": "affected" }, { "version": "7.0(3)I4(8b)", "status": "affected" }, { "version": "6.0(2)A8(3)", "status": "affected" }, { "version": "7.0(3)I4(6t)", "status": "affected" }, { "version": "7.0(3)I5(3a)", "status": "affected" }, { "version": "6.0(2)A8(8)", "status": "affected" }, { "version": "7.0(3)I7(5)", "status": "affected" }, { "version": "7.0(3)F3(3a)", "status": "affected" }, { "version": "6.0(2)A8(4)", "status": "affected" }, { "version": "7.0(3)I4(8a)", "status": "affected" }, { "version": "7.0(3)F3(2)", "status": "affected" }, { "version": "7.0(3)I4(4)", "status": "affected" }, { "version": "7.0(3)I7(1)", "status": "affected" }, { "version": "7.0(3)IA7(2)", "status": "affected" }, { "version": "7.0(3)IA7(1)", "status": "affected" }, { "version": "6.0(2)A8(7b)", "status": "affected" }, { "version": "6.0(2)A8(4a)", "status": "affected" }, { "version": "9.3(3)", "status": "affected" }, { "version": "7.0(3)I7(8)", "status": "affected" }, { "version": "9.3(4)", "status": "affected" }, { "version": "9.3(5)", "status": "affected" }, { "version": "7.0(3)I7(9)", "status": "affected" }, { "version": "9.3(6)", "status": "affected" }, { "version": "10.1(2)", "status": "affected" }, { "version": "10.1(1)", "status": "affected" }, { "version": "9.3(5w)", "status": "affected" }, { "version": "9.3(7)", "status": "affected" }, { "version": "9.3(7k)", "status": "affected" }, { "version": "7.0(3)I7(9w)", "status": "affected" }, { "version": "10.2(1)", "status": "affected" }, { "version": "9.3(7a)", "status": "affected" }, { "version": "9.3(8)", "status": "affected" }, { "version": "7.0(3)I7(10)", "status": "affected" }, { "version": "10.2(1q)", "status": "affected" }, { "version": "10.2(2)", "status": "affected" }, { "version": "9.3(9)", "status": "affected" }, { "version": "10.1(2t)", "status": "affected" }, { "version": "10.2(3)", "status": "affected" }, { "version": "10.2(3t)", "status": "affected" }, { "version": "9.3(10)", "status": "affected" }, { "version": "10.2(2a)", "status": "affected" }, { "version": "10.3(1)", "status": "affected" }, { "version": "10.2(4)", "status": "affected" }, { "version": "10.3(2)", "status": "affected" }, { "version": "9.3(11)", "status": "affected" }, { "version": "10.3(3)", "status": "affected" }, { "version": "10.2(5)", "status": "affected" }, { "version": "9.3(12)", "status": "affected" }, { "version": "10.2(3v)", "status": "affected" }, { "version": "10.4(1)", "status": "affected" }, { "version": "10.3(99w)", "status": "affected" }, { "version": "10.2(6)", "status": "affected" }, { "version": "10.3(3w)", "status": "affected" }, { "version": "10.3(99x)", "status": "affected" }, { "version": "10.3(3o)", "status": "affected" }, { "version": "10.3(4)", "status": "affected" }, { "version": "10.3(3p)", "status": "affected" }, { "version": "10.3(4a)", "status": "affected" }, { "version": "10.4(2)", "status": "affected" }, { "version": "10.3(3q)", "status": "affected" }, { "version": "9.3(13)", "status": "affected" }, { "version": "10.3(5)", "status": "affected" }, { "version": "10.2(7)", "status": "affected" }, { "version": "10.4(3)", "status": "affected" }, { "version": "10.3(3x)", "status": "affected" }, { "version": "10.3(4g)", "status": "affected" }, { "version": "10.5(1)", "status": "affected" }, { "version": "10.2(8)", "status": "affected" }, { "version": "10.3(3r)", "status": "affected" }, { "version": "10.3(6)", "status": "affected" }, { "version": "9.3(14)", "status": "affected" }, { "version": "10.4(4)", "status": "affected" }, { "version": "10.3(4h)", "status": "affected" }, { "version": "10.5(2)", "status": "affected" }, { "version": "10.4(4g)", "status": "affected" } ] } ] } } }