TI-2021-18582 Aliases CVE-2021-42073 GHSA-fm32-wgpg-7rc9

An issue was discovered in Barrier before 2.4.0.

LOW 39CWE-384Published 2021-11-08 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: High · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-384.

Summary

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.

Why it matters now

EPSS 0.01457 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:barrier_project:barrier::::::::	before 2.4.0	Vulnerable	Barrier Project

cpe:2.3:a:barrier_project:barrier:*:*:*:*:*:*:*:* Versions before 2.4.0 Vulnerable ·Barrier Project

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2021-42073
2026-10-03 Alias added: GHSA-fm32-wgpg-7rc9

References

Exploit 1

[oss-security] 20211102 Barrier "software KVM switch" multiple remote security issues

Advisory 1

https://github.com/debauchee/barrier/releases/tag/v2.4.0

Other 2

TI-2021-18581 An issue was discovered in Barrier before 2.4.0. CVSS 3.1HIGH 8.8
TI-2021-18584 An issue was discovered in Barrier before 2.3.4. CVSS 3.1HIGH 7.5
TI-2021-18585 An issue was discovered in Barrier before 2.3.4. CVSS 3.1HIGH 7.5
TI-2021-18583 An issue was discovered in Barrier before 2.3.4. CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences