{ "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-2024-20266", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-20266", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-03-13T16:42:27.815Z", "updatedAt": "2024-08-14T15:00:38.372Z", "importedAt": "2026-10-24T01:57:07.518Z", "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 DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.\r\n\r This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.\r\n\r Notes: \r\n\r \r Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.\r This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.", "affected": [ { "vendor": "Cisco", "product": "Cisco IOS XR Software", "versions": [ { "version": "5.2.0", "status": "affected" }, { "version": "5.2.1", "status": "affected" }, { "version": "5.2.2", "status": "affected" }, { "version": "5.2.4", "status": "affected" }, { "version": "5.2.3", "status": "affected" }, { "version": "5.2.5", "status": "affected" }, { "version": "5.2.47", "status": "affected" }, { "version": "5.3.0", "status": "affected" }, { "version": "5.3.1", "status": "affected" }, { "version": "5.3.2", "status": "affected" }, { "version": "5.3.3", "status": "affected" }, { "version": "5.3.4", "status": "affected" }, { "version": "6.0.0", "status": "affected" }, { "version": "6.0.1", "status": "affected" }, { "version": "6.0.2", "status": "affected" }, { "version": "6.1.1", "status": "affected" }, { "version": "6.1.2", "status": "affected" }, { "version": "6.1.3", "status": "affected" }, { "version": "6.1.4", "status": "affected" }, { "version": "6.1.12", "status": "affected" }, { "version": "6.1.22", "status": "affected" }, { "version": "6.1.32", "status": "affected" }, { "version": "6.1.36", "status": "affected" }, { "version": "6.1.42", "status": "affected" }, { "version": "6.2.1", "status": "affected" }, { "version": "6.2.2", "status": "affected" }, { "version": "6.2.3", "status": "affected" }, { "version": "6.2.25", "status": "affected" }, { "version": "6.2.11", "status": "affected" }, { "version": "6.3.2", "status": "affected" }, { "version": "6.3.3", "status": "affected" }, { "version": "6.3.15", "status": "affected" }, { "version": "6.4.1", "status": "affected" }, { "version": "6.4.2", "status": "affected" }, { "version": "6.4.3", "status": "affected" }, { "version": "6.5.1", "status": "affected" }, { "version": "6.5.2", "status": "affected" }, { "version": "6.5.3", "status": "affected" }, { "version": "6.5.25", "status": "affected" }, { "version": "6.5.26", "status": "affected" }, { "version": "6.5.28", "status": "affected" }, { "version": "6.5.29", "status": "affected" }, { "version": "6.5.32", "status": "affected" }, { "version": "6.5.33", "status": "affected" }, { "version": "6.6.2", "status": "affected" }, { "version": "6.6.3", "status": "affected" }, { "version": "6.6.25", "status": "affected" }, { "version": "6.6.4", "status": "affected" }, { "version": "7.0.1", "status": "affected" }, { "version": "7.0.2", "status": "affected" }, { "version": "7.0.12", "status": "affected" }, { "version": "7.0.14", "status": "affected" }, { "version": "7.1.1", "status": "affected" }, { "version": "7.1.15", "status": "affected" }, { "version": "7.1.2", "status": "affected" }, { "version": "7.1.3", "status": "affected" }, { "version": "6.7.1", "status": "affected" }, { "version": "6.7.2", "status": "affected" }, { "version": "6.7.3", "status": "affected" }, { "version": "6.7.4", "status": "affected" }, { "version": "7.2.0", "status": "affected" }, { "version": "7.2.1", "status": "affected" }, { "version": "7.2.2", "status": "affected" }, { "version": "7.3.1", "status": "affected" }, { "version": "7.3.15", "status": "affected" }, { "version": "7.3.2", "status": "affected" }, { "version": "7.3.3", "status": "affected" }, { "version": "7.3.5", "status": "affected" }, { "version": "7.4.1", "status": "affected" }, { "version": "7.4.2", "status": "affected" }, { "version": "6.8.1", "status": "affected" }, { "version": "6.8.2", "status": "affected" }, { "version": "7.5.1", "status": "affected" }, { "version": "7.5.3", "status": "affected" }, { "version": "7.5.2", "status": "affected" }, { "version": "7.5.4", "status": "affected" }, { "version": "7.5.5", "status": "affected" }, { "version": "7.6.1", "status": "affected" }, { "version": "7.6.2", "status": "affected" }, { "version": "7.7.1", "status": "affected" }, { "version": "7.7.2", "status": "affected" }, { "version": "7.7.21", "status": "affected" }, { "version": "6.9.1", "status": "affected" }, { "version": "6.9.2", "status": "affected" }, { "version": "7.8.1", "status": "affected" }, { "version": "7.8.2", "status": "affected" }, { "version": "7.9.1", "status": "affected" }, { "version": "7.9.2", "status": "affected" }, { "version": "7.9.21", "status": "affected" }, { "version": "7.10.1", "status": "affected" }, { "version": "7.10.2", "status": "affected" } ] } ] } } }