CVE-2006-0591: Solar Designer Crypt Blowfish

Low severity, CVSS 1.2. EPSS: 0.4% chance of exploitation in the next 30 days.

The crypt_gensalt functions for BSDI-style extended DES-based and FreeBSD-sytle MD5-based password hashes in crypt_blowfish 0.4.7 and earlier do not evenly and randomly distribute salts, which makes it easier for attackers to guess passwords from a stolen password file due to the increased number of collisions.

Affected products

Published 2006-02-08. Last modified 2026-06-16.