CVE-2021-42074

HIGH

Barrier < 2.3.4 - Unauthenticated Use-After-Free via Rapid TCP Hello Messages

Title source: llm
STIX 2.1

Description

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.

References (2)

Core 2
Core References
Exploit, Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/11/02/4
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/debauchee/barrier/releases/tag/v2.3.4

Scores

CVSS v3 7.5
EPSS 0.0170
EPSS Percentile 74.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-416
Status published
Products (1)
barrier_project/barrier < 2.3.4
Published Nov 08, 2021
Tracked Since Feb 18, 2026