{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-08-04T23:24:32.018","vulnerabilities":[{"cve":{"id":"CVE-2021-22161","sourceIdentifier":"cve@mitre.org","published":"2021-02-07T23:15:12.273","lastModified":"2026-06-17T03:36:43.530","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"In OpenWrt 19.07.x before 19.07.7, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set. This affects the netifd and odhcp6c packages."},{"lang":"es","value":"En OpenWrt versiones 19.07.x anteriores a 19.07.7, cuando es usado IPv6, puede ocurrir un bucle de enrutamiento que genere un tráfico de red excesivo entre un dispositivo afectado y el enrutador de su ISP ascendente. Esto ocurre cuando una ruta de prefijo de enlace apunta a un enlace de punto a punto, una dirección IPv6 de destino pertenece al prefijo y no es una dirección IPv6 local, y se recibe un anuncio de enrutamiento con al menos un prefijo IPv6 único global para el que es ajustado el flag on-link. Esto afecta a los paquetes netifd y odhcp6c"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:A/AC:L/Au:N/C:N/I:N/A:P","baseScore":3.3,"accessVector":"ADJACENT_NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"LOW","exploitabilityScore":6.5,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-835"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*","versionStartIncluding":"19.07.0","versionEndIncluding":"19.07.6","matchCriteriaId":"B9B137F0-E0CB-426E-AB76-3B1FC53097DE"}]}]}],"references":[{"url":"https://openwrt.org/advisory/2021-02-02-1","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://openwrt.org/advisory/2021-02-02-1","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]}]}}]}