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    CVE-2005-0366

    The integrity check feature in OpenPGP, when handling a message that was encrypted using cipher feedback (CFB) mode, allows remote attackers to recover part of the plaintext via a chosen-ciphertext attack when the first 2 bytes of a message block are known, and an oracle or other mechanism is available to determine whether an integrity check failed.

    Published:Feb 11, 2005
    Last Modified:Apr 16, 2026
    EPS:Feb 11, 2005
    EPSS Score:0.07683
    CVSS Score:5

    Affected Products

    Vendor
    Gnupg
    Product
    Gnupg

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-326 Inadequate Encryption Strength

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-112 Brute Force
    CAPEC-192 Protocol Analysis
    CAPEC-20 Encryption Brute Forcing

    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://eprint.iacr.org/2005/033
    http://eprint.iacr.org/2005/033.pdf
    http://securitytracker.com/id?1013166
    http://www.gentoo.org/security/en/glsa/glsa-200503-29.xml
    http://www.kb.cert.org/vuls/id/303094
    http://www.mandriva.com/security/advisories?name=MDKSA-2005:057
    http://www.novell.com/linux/security/advisories/2005_07_sr.html
    http://www.osvdb.org/13775
    http://www.pgp.com/library/ctocorner/openpgp.html
    http://www.securityfocus.com/bid/12529
    http://eprint.iacr.org/2005/033
    http://eprint.iacr.org/2005/033.pdf
    http://securitytracker.com/id?1013166
    http://www.gentoo.org/security/en/glsa/glsa-200503-29.xml
    http://www.kb.cert.org/vuls/id/303094
    http://www.mandriva.com/security/advisories?name=MDKSA-2005:057
    http://www.novell.com/linux/security/advisories/2005_07_sr.html
    http://www.osvdb.org/13775
    http://www.pgp.com/library/ctocorner/openpgp.html
    http://www.securityfocus.com/bid/12529

    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