CVE-2001-0572: OpenBSD OpenSSH

High severity, CVSS 7.5. EPSS: 7.1% chance of exploitation in the next 30 days.

The SSH protocols 1 and 2 (aka SSH-2) as implemented in OpenSSH and other packages have various weaknesses which can allow a remote attacker to obtain the following information via sniffing: (1) password lengths or ranges of lengths, which simplifies brute force password guessing, (2) whether RSA or DSA authentication is being used, (3) the number of authorized_keys in RSA authentication, or (4) the lengths of shell commands.

Affected products

• OpenBSD OpenSSH: version 4.5 only
• SSH SSH: version 1.2.24 only; version 1.2.25 only; version 1.2.26 only; version 1.2.27 only; version 1.2.28 only; version 1.2.29 only; …

Published 2001-08-22. Last modified 2026-06-16.