UBUNTU-CVE-2021-40346

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    UBUNTU-CVE-2021-40346

    Published: 7 Sept 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-40346
    Aliases:
    USN-5063-1

    Summary:

    Details: An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

    References: https://ubuntu.com/security/CVE-2021-40346, https://www.mail-archive.com/[email protected]/msg41114.html, https://ubuntu.com/security/notices/USN-5063-1, https://www.cve.org/CVERecord?id=CVE-2021-40346

    Affected packages

    Package

    Name: haproxy

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.0.13-2ubuntu0.3

    Affected versions

    2.0.5-1
    2.0.8-1
    2.0.9-1
    2.0.10-1
    2.0.10-1ubuntu1
    2.0.11-1ubuntu1
    2.0.12-1ubuntu2
    2.0.13-1ubuntu2
    2.0.13-2
    2.0.13-2ubuntu0.1
    2.0.13-2ubuntu0.2

    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-2021-40346 | CVE-DB