CVE-2005-0366

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2005-05-02 · updated 2026-06-16
Weakness: CWE-326

Description

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.

Affected products

GnuPG: before 1.4.1 — fixed in 1.4.1

How to fix

Upgrade to a fixed version: GnuPG 1.4.1. Check the vendor advisory for mitigations.

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

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