The integrity check feature in OpenPGP, when handling a message that was encrypted using cipher feedback (CFB) mode, allows remote attacker…

published 2005-02-11 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-0367

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

gnupg gnupg 1.4.1

Exploit prediction

2.95% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-326 Inadequate Encryption Strength

References

gentoo.org /security/en/glsa/glsa-200503-29.xml
vendor-advisory, third-party-advisory
mandriva.com /security/advisories?name=MDKSA-2005:057
vendor-advisory, broken-link
novell.com /linux/security/advisories/2005_07_sr.html
vendor-advisory, broken-link
osvdb.org /13775
vdb-entry, broken-link
kb.cert.org /vuls/id/303094
third-party-advisory, us-government-resource
securitytracker.com /id?1013166
vdb-entry, third-party-advisory
pgp.com /library/ctocorner/openpgp.html
broken-link
securityfocus.com /bid/12529
vdb-entry, third-party-advisory
eprint.iacr.org /2005/033.pdf
technical-description, third-party-advisory
eprint.iacr.org /2005/033
third-party-advisory

Sources

CVE List CVE-2005-0366
NVD CVE-2005-0366

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary