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CVE-2021-42073

8.2 · HIGH

An issue was discovered in Barrier before 2.4.0.

Published Nov 8, 2021CWE-384EPSS 1.46%

Overview

CVE-2021-42073 is a high-severity vulnerability. It was published on November 8, 2021 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2021/11/02/4GitHubgithub.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedccGitHubgithub.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3eGitHubgithub.com/debauchee/barrier/releases/tag/v2.4.0Refwww.openwall.com/lists/oss-security/2021/11/02/4GitHubgithub.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedccGitHubgithub.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3eGitHubgithub.com/debauchee/barrier/releases/tag/v2.4.0

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42073?

CVE-2021-42073 is a high-severity vulnerability. It was published on November 8, 2021 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-42073?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-42073?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-42073?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42073 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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