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4.6

OpenPGP can expose private signing key

CVE-2001-0381 · published 25 years ago
Summary

The OpenPGP encryption standard can allow an attacker to discover a user’s private signing key by modifying the encrypted key file and then observing a single signed message. If this occurs, the attacker could forge documents or emails appearing to come from the legitimate user. Update to a version of OpenPGP that includes the fix or apply the recommended patch as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
pgp openpgp All versions
cpe:2.3:a:pgp:openpgp:*:*:*:*:*:*:*:*
Original advisory text
The OpenPGP PGP standard allows an attacker to determine the private signature key via a cryptanalytic attack in which the attacker alters the encrypted private key file and captures a single messa...
The OpenPGP PGP standard allows an attacker to determine the private signature key via a cryptanalytic attack in which the attacker alters the encrypted private key file and captures a single message signed with the signature key.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
4.6 Medium
Exploitation
<1% chance of attack within 30 days
Timeline
Published27 Jun 2001
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2001-0381 · NVD
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