0-byte UDP payload DoS in c-ares
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.6%
exploitation probability
1.6%top 27% of all CVEs
observed exploitation
nono source reports it
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
c-ares · c-aresReferences
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vchttps://lists.debian.org/debian-lts-announce/2023/06/msg00034.htmlhttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/https://security.gentoo.org/glsa/202310-09https://security.netapp.com/advisory/ntap-20240605-0004/https://www.debian.org/security/2023/dsa-5419