CVE-2020-1763: Libreswan

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending specially-crafted IKEv1 Informational Exchange packets. The daemon respawns after the crash.

Affected products

• Libreswan Libreswan: from 3.27, up to and including 3.31; version 3.5 only

Published 2020-05-12. Last modified 2026-06-17.