UBUNTU-CVE-2020-11993

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    UBUNTU-CVE-2020-11993

    Published: 7 Aug 2020Last Modified: 22 Apr 2026
    Upstream:
    CVE-2020-11993
    Aliases:
    USN-4458-1

    Summary:

    Details: Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.

    References: https://ubuntu.com/security/CVE-2020-11993, https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993, https://www.openwall.com/lists/oss-security/2020/08/07/3, https://ubuntu.com/security/notices/USN-4458-1, https://www.cve.org/CVERecord?id=CVE-2020-11993

    Affected packages

    Package

    Name: apache2

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.4.29-1ubuntu4.14

    Affected versions

    2.4.27-2ubuntu3
    2.4.29-1ubuntu1
    2.4.29-1ubuntu2
    2.4.29-1ubuntu3
    2.4.29-1ubuntu4
    2.4.29-1ubuntu4.1
    2.4.29-1ubuntu4.2
    2.4.29-1ubuntu4.3
    2.4.29-1ubuntu4.4
    2.4.29-1ubuntu4.5
    2.4.29-1ubuntu4.6
    2.4.29-1ubuntu4.7
    2.4.29-1ubuntu4.8
    2.4.29-1ubuntu4.10
    2.4.29-1ubuntu4.11
    2.4.29-1ubuntu4.12
    2.4.29-1ubuntu4.13

    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-2020-11993 | CVE-DB