USN-6901-1

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    USN-6901-1

    Published: 18 Jul 2024Last Modified: 10 Feb 2026

    Summary: stunnel4 vulnerability

    Details: It was discovered that stunnel did not properly validate client certificates when configured to use both the redirect and verifyChain options. A remote attacker could potentially use this issue to obtain sensitive information by accessing the tunneled service.

    References: https://ubuntu.com/security/notices/USN-6901-1, https://ubuntu.com/security/CVE-2021-20230

    Affected packages

    Package

    Name: stunnel4

    Purl: pkg:deb/ubuntu/stunnel4@3:5.44-1ubuntu3+esm1?arch=source&distro=esm-apps/bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3:5.44-1ubuntu3+esm1

    Affected versions

    3:5.39-2

    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
    USN-6901-1 | CVE-DB