CVE-2022-40617: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

strongSwan before 5.9.8 allows remote attackers to cause a denial of service in the revocation plugin by sending a crafted end-entity (and intermediate CA) certificate that contains a CRL/OCSP URL that points to a server (under the attacker's control) that doesn't properly respond but (for example) just does nothing after the initial TCP handshake, or sends an excessive amount of application data.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 20.04 only; version 22.04 only
• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 37 only
• Stormshield Stormshield Network Security: from 3.11.1, before 3.11.20 (fixed in 3.11.20); from 4.3.1, before 4.3.15 (fixed in 4.3.15); from 4.5.1, before 4.6.0 (fixed in 4.6.0)
• Strongswan Strongswan: before 5.9.8 (fixed in 5.9.8)

Published 2022-10-31. Last modified 2026-06-17.