CVE-2023-41913: Strongswan

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

strongSwan before 5.9.12 has a buffer overflow and possible unauthenticated remote code execution via a DH public value that exceeds the internal buffer in charon-tkm's DH proxy. The earliest affected version is 5.3.0. An attack can occur via a crafted IKE_SA_INIT message.

Affected products

• Strongswan Strongswan: from 5.3.0, before 5.9.12 (fixed in 5.9.12)

Published 2023-12-07. Last modified 2026-06-17.