CVE-2013-4351: Gnupg

Medium severity, CVSS 5.8. EPSS: 2.5% chance of exploitation in the next 30 days.

GnuPG 1.4.x, 2.0.x, and 2.1.x treats a key flags subpacket with all bits cleared (no usage permitted) as if it has all bits set (all usage permitted), which might allow remote attackers to bypass intended cryptographic protection mechanisms by leveraging the subkey.

Affected products

• Gnupg Gnupg: version 1.4.0 only; version 1.4.2 only; version 1.4.3 only; version 1.4.4 only; version 1.4.5 only; version 1.4.6 only; …

Published 2013-10-10. Last modified 2026-06-16.