CVE-2021-42075: Barrier Project Barrier

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

An issue was discovered in Barrier before 2.3.4. The barriers component (aka the server-side implementation of Barrier) does not correctly close file descriptors for established TCP connections. An unauthenticated remote attacker can thus cause file descriptor exhaustion in the server process, leading to denial of service.

Affected products

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

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