CVE-2013-4351

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-10-10 · updated 2026-06-16
Weakness: CWE-310

Description

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: 1.4.0, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6 (+24)

References

http://lists.opensuse.org/opensuse-updates/2013-10/msg00003.html
http://lists.opensuse.org/opensuse-updates/2013-10/msg00006.html
http://rhn.redhat.com/errata/RHSA-2013-1459.html
http://thread.gmane.org/gmane.comp.encryption.gpg.devel/17712/focus=18138
http://ubuntu.com/usn/usn-1987-1
http://www.debian.org/security/2013/dsa-2773
http://www.debian.org/security/2013/dsa-2774
http://www.openwall.com/lists/oss-security/2013/09/13/4
https://bugzilla.redhat.com/show_bug.cgi?id=1010137
http://lists.opensuse.org/opensuse-updates/2013-10/msg00003.html
http://lists.opensuse.org/opensuse-updates/2013-10/msg00006.html
http://rhn.redhat.com/errata/RHSA-2013-1459.html

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