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No exploitation reportedFix available

CVE-2021-42073

No exploitation reported by the sources we read.

  • Published2021-11-08
  • Fixed in2.4.0
  • WeaknessCWE-384

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-11-0804:15CVE publishedNVD

Versions per branch

NVD
Barrier project barrier
BranchAffectedFixed in
2.4< 2.4.02.4.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • barrierSUSE:Package Hub 15 SP3all versions · fixed in 2.4.0-bp153.2.3.1
  • barrieropenSUSE:Tumbleweedall versions · fixed in 2.4.0-1.1
  • barrieropenSUSE:Leap 15.3all versions · fixed in 2.4.0-bp153.2.3.1
  • barrieropenSUSE:Leap 15.2all versions · fixed in 2.4.0-lp152.3.6.1

Vendor advisories

  • CVE-2021-42073 Red Hat Product Security

    barrier: knowing a valid client name allows information leaks and server manipulation

Full record on NVD

Fix

  1. Update Barrier project barrier to 2.4.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Published
2021-11-08
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fm32-wgpg-7rc9

Frequently asked questions

What is 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.

Is CVE-2021-42073 actively exploited?

Active exploitation of CVE-2021-42073 has not been confirmed. Its EPSS score was 1.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-42073?

CVE-2021-42073 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

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