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    CVE-2013-4351

    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.

    Published:Mar 12, 2013
    Last Modified:Apr 11, 2025
    EPS:Oct 10, 2013
    EPSS Score:0.0155
    CVSS Score:5.8

    Affected Products

    Vendor
    Gnupg
    Product
    Gnupg
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-57062 (CVSS 2.9) — CMS (Cryptographic Message Syntax) parsing in gpgsm in GnuPG through 2.5.20 mishandles the CMS format for AES-…
    CVE-2026-24883 (CVSS 3.7) — In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data…
    CVE-2026-24882 (CVSS 8.4) — In GnuPG before 2.5.17, a stack-based buffer overflow exists in tpm2daemon during handling of the PKDECRYPT co…
    CVE-2026-24881 (CVSS 8.1) — In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key…
    CVE-2025-68973 (CVSS 7.8) — In GnuPG before 2.4.9, armor_filter in g10/armor.c has two increments of an index variable where one is intend…
    CVE-2025-68972 (CVSS 5.9) — In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct …
    CVE-2025-30258 (CVSS 2.7) — In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a…
    CVE-2022-3515 (CVSS 9.8) — A vulnerability was found in the Libksba library due to an integer overflow within the CRL parser. The vulnera…
    CVE-2022-3219 (CVSS 3.3) — GnuPG can be made to spin on a relatively small input by (for example) crafting a public key with thousands of…
    CVE-2022-34903 (CVSS 6.5) — GnuPG through 2.3.6, in unusual situations where an attacker possesses any secret-key information from a victi…

    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High