CVE-2004-0220: OpenBSD

High severity, CVSS 10.0. EPSS: 4.6% chance of exploitation in the next 30 days.

isakmpd in OpenBSD 3.4 and earlier allows remote attackers to cause a denial of service via an ISAKMP packet with a malformed Cert Request payload, which causes an integer underflow that is used in a malloc operation that is not properly handled, as demonstrated by the Striker ISAKMP Protocol Test Suite.

Affected products

• OpenBSD OpenBSD: up to and including 3.4

Published 2004-05-04. Last modified 2026-06-16.