Vulnerability in Barrier Project
CVE-2021-42073
An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component (aka the server-side implementation of Barrier) simply by supplying a client label that identifies a valid client configuration. This label is "Unnamed" by default but could instead be guessed from hostnames or other publicly available information. In the active session state, an attacker can capture input device events from the server, and also modify the clipboard content on the server.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.015 (72.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2021/11/02/4 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- github.com/debauchee/barrier/releases/tag/v2.4.0 (Third Party Advisory, Release Notes)
- github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e
- github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc
Frequently asked questions
- What is CVE-2021-42073?
- CVE-2021-42073 is a high-severity vulnerability in Barrier Project, classified under Session Fixation. CVSS score: 8.2/10. Published 2021-11-08.
- How severe is CVE-2021-42073?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2021-42073 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.