CVE-2006-4924: OpenBSD OpenSSH

High severity, CVSS 7.8. EPSS: 37.5% chance of exploitation in the next 30 days.

sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector.

Affected products

• OpenBSD OpenSSH: version 1.2 only; version 1.2.1 only; version 1.2.2 only; version 1.2.3 only; version 1.2.27 only; version 2.1 only; …

Published 2006-09-27. Last modified 2026-06-16.