CVE-2005-0740: OpenBSD

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

The TCP stack (tcp_input.c) in OpenBSD 3.5 and 3.6 allows remote attackers to cause a denial of service (system panic) via crafted values in the TCP timestamp option, which causes invalid arguments to be used when calculating the retransmit timeout.

Affected products

• OpenBSD OpenBSD: version 2.0 only; version 2.1 only; version 2.2 only; version 2.3 only; version 2.4 only; version 2.5 only; …

Published 2005-01-13. Last modified 2026-06-16.