CVE-2021-42073

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    CVE-2021-42073

    Published: 8 Nov 2021Last Modified: 9 Jul 2026

    Summary:

    Details: 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.

    References: https://github.com/debauchee/barrier/releases/tag/v2.4.0, https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc, https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e, http://www.openwall.com/lists/oss-security/2021/11/02/4

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -3e0d758b59e44e6bb8b5e13cf96c824be44207ac

    Affected versions

    v2.3.3
    v2.3.2
    v2.3.1
    v2.3.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-42073 | CVE-DB