CVE-2009-5138: GNU Gnutls

Medium severity, CVSS 5.8. EPSS: 1.8% chance of exploitation in the next 30 days.

GnuTLS before 2.7.6, when the GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT flag is not enabled, treats version 1 X.509 certificates as intermediate CAs, which allows remote attackers to bypass intended restrictions by leveraging a X.509 V1 certificate from a trusted CA to issue new certificates, a different vulnerability than CVE-2014-1959.

Affected products

• GNU Gnutls: up to and including 2.7.5; version 2.7.0 only; version 2.7.1 only; version 2.7.2 only; version 2.7.3 only; version 2.7.4 only

Published 2014-03-07. Last modified 2026-06-16.