CVE-2009-2661: Strongswan

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

The asn1_length function in strongSwan 2.8 before 2.8.11, 4.2 before 4.2.17, and 4.3 before 4.3.3 does not properly handle X.509 certificates with crafted Relative Distinguished Names (RDNs), which allows remote attackers to cause a denial of service (pluto IKE daemon crash) via malformed ASN.1 data. NOTE: this is due to an incomplete fix for CVE-2009-2185.

Affected products

• Strongswan Strongswan: version 2.8.0 only; version 2.8.1 only; version 2.8.2 only; version 2.8.3 only; version 2.8.4 only; version 2.8.5 only; …

Published 2009-08-04. Last modified 2026-06-16.