CVE-2018-5388: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 3.9% chance of exploitation in the next 30 days.

In stroke_socket.c in strongSwan before 5.6.3, a missing packet length check could allow a buffer underflow, which may lead to resource exhaustion and denial of service while reading from the socket.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Strongswan Strongswan: before 5.6.3 (fixed in 5.6.3)

Published 2018-05-31. Last modified 2026-06-17.