USN-5203-1

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    USN-5203-1

    Published: 19 Dec 2021Last Modified: 1 Jun 2026

    Summary: apache-log4j2 vulnerability

    Details: Hideki Okamoto and Guy Lederfein discovered that Apache Log4j 2 did not protect against infinite recursion in lookup evaluation. A remote attacker could possibly use this issue to cause Apache Log4j 2 to crash, leading to a denial of service. Please see the following link for more information: https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Log4Shell

    References: https://ubuntu.com/security/notices/USN-5203-1, https://ubuntu.com/security/CVE-2021-45105

    Affected packages

    Package

    Name: apache-log4j2

    Purl: pkg:deb/ubuntu/apache-log4j2?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.17.0-0.20.04.1

    Affected versions

    2.11.1-2
    2.11.2-1

    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
    USN-5203-1 | CVE-DB