CVE-2021-3935

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    CVE-2021-3935

    Published: 22 Nov 2021Last Modified: 15 Mar 2026

    Summary:

    Details: When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNPCV3KRDI5PLLLKADFVIOHACQJLZMLI/, https://lists.debian.org/debian-lts-announce/2025/05/msg00032.html, https://lists.debian.org/debian-lts-announce/2022/02/msg00016.html, http://www.pgbouncer.org/changelog.html#pgbouncer-116x, https://bugzilla.redhat.com/show_bug.cgi?id=2021251

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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-2021-3935 | CVE-DB