UBUNTU-CVE-2021-45105

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    UBUNTU-CVE-2021-45105

    Published: 19 Dec 2021Last Modified: 1 Jun 2026
    Upstream:
    CVE-2021-45105

    Summary:

    Details: Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.

    References: https://ubuntu.com/security/CVE-2021-45105, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell, https://logging.apache.org/log4j/2.x/security.html#CVE-2021-45105, https://ubuntu.com/security/notices/USN-5203-1, https://ubuntu.com/security/notices/USN-5222-1, https://www.cve.org/CVERecord?id=CVE-2021-45105

    Affected packages

    Package

    Name: apache-log4j2

    Purl: pkg:deb/ubuntu/apache-log4j2?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.2-1

    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-2021-45105 | CVE-DB