Use After Free in Barrier Project

CVE-2021-42074

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.

Vulnerability class: Use-After-Free

EPSS: 0.017 (74.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

  • cve@mitre.org (mailing-list, x_refsource_MLIST, Exploit, Mailing List, Third Party Advisory)
  • cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2021-42074?
CVE-2021-42074 is a high-severity vulnerability in Barrier Project, classified under Use After Free. CVSS score: 7.5/10. Published 2021-11-08.
How severe is CVE-2021-42074?
High severity. CVSS v3 base score is 7.5 out of 10.