CVE-2009-2730: GNU Gnutls

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

libgnutls in GnuTLS before 2.8.2 does not properly handle a '\0' character in a domain name in the subject's (1) Common Name (CN) or (2) Subject Alternative Name (SAN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

Affected products

• GNU Gnutls: up to and including 2.8.1; version 1.0.16 only; version 1.0.17 only; version 1.0.18 only; version 1.0.19 only; version 1.0.20 only; …

Published 2009-08-12. Last modified 2026-06-16.