CVE-2021-42074: Barrier Project Barrier

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

An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.

Affected products

• Barrier Project Barrier: before 2.3.4 (fixed in 2.3.4)

Published 2021-11-08. Last modified 2026-06-17.