UBUNTU-CVE-2021-40438

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-40438

    UBUNTU-CVE-2021-40438

    Published: 16 Sept 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-40438

    Summary:

    Details: A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

    References: https://ubuntu.com/security/CVE-2021-40438, https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-40438, https://httpd.apache.org/security/vulnerabilities_24.html, https://ubuntu.com/security/notices/USN-5090-1, https://ubuntu.com/security/notices/USN-5090-2, https://ubuntu.com/security/notices/USN-5090-3, https://ubuntu.com/security/notices/USN-5090-2, https://www.cve.org/CVERecord?id=CVE-2021-40438, https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Affected packages

    Package

    Name: apache2

    Purl: pkg:deb/ubuntu/[email protected]+esm3?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.4.18-2ubuntu3.17+esm3

    Affected versions

    2.4.12-2ubuntu2
    2.4.17-1ubuntu1
    2.4.17-2ubuntu1
    2.4.17-3ubuntu1
    2.4.18-1ubuntu1
    2.4.18-2ubuntu1
    2.4.18-2ubuntu2
    2.4.18-2ubuntu3
    2.4.18-2ubuntu3.1
    2.4.18-2ubuntu3.2
    2.4.18-2ubuntu3.3
    2.4.18-2ubuntu3.4
    2.4.18-2ubuntu3.5
    2.4.18-2ubuntu3.7
    2.4.18-2ubuntu3.8
    2.4.18-2ubuntu3.9
    2.4.18-2ubuntu3.10
    2.4.18-2ubuntu3.12
    2.4.18-2ubuntu3.13
    2.4.18-2ubuntu3.14
    2.4.18-2ubuntu3.15
    2.4.18-2ubuntu3.17
    2.4.18-2ubuntu3.17+esm1
    2.4.18-2ubuntu3.17+esm2

    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-2021-40438 | CVE-DB