UBUNTU-CVE-2021-44273

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    UBUNTU-CVE-2021-44273

    Published: 23 Dec 2021Last Modified: 20 May 2026
    Upstream:
    CVE-2021-44273

    Summary:

    Details: e2guardian v5.4.x <= v5.4.3r is affected by missing SSL certificate validation in the SSL MITM engine. In standalone mode (i.e., acting as a proxy or a transparent proxy), with SSL MITM enabled, e2guardian, if built with OpenSSL v1.1.x, did not validate hostnames in certificates of the web servers that it connected to, and thus was itself vulnerable to MITM attacks.

    References: https://ubuntu.com/security/CVE-2021-44273, https://www.openwall.com/lists/oss-security/2021/12/23/2, https://github.com/e2guardian/e2guardian/issues/707, https://github.com/e2guardian/e2guardian/commit/eae46a7e2a57103aadca903c4a24cca94dc502a2, http://www.openwall.com/lists/oss-security/2021/12/23/2, https://www.cve.org/CVERecord?id=CVE-2021-44273

    Affected packages

    Package

    Name: e2guardian

    Purl: pkg:deb/ubuntu/e2guardian?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.4.0.3-2

    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
    UBUNTU-CVE-2021-44273 | CVE-DB