CVE-2023-32067: C-Ares Project C-Ares

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• C-Ares Project C-Ares: before 1.19.1 (fixed in 1.19.1)
• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 37 only; version 38 only

Published 2023-05-25. Last modified 2026-06-17.