CVE-2021-45105

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    CVE-2021-45105

    Published: 18 Dec 2021Last Modified: 20 Oct 2026

    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: http://www.openwall.com/lists/oss-security/2021/12/19/1, https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf, https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf, https://logging.apache.org/log4j/2.x/security.html, https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032, https://security.netapp.com/advisory/ntap-20211218-0001/, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd, https://www.debian.org/security/2021/dsa-5024, https://www.kb.cert.org/vuls/id/930724, https://www.oracle.com/security-alerts/cpujul2022.html, https://www.zerodayinitiative.com/advisories/ZDI-21-1541/, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.oracle.com/security-alerts/cpujan2022.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 8d9204a4b4c6016fa6b36513a46502689d6a45c1
    Fixed -38513a7d57343881f7bf58f37e67d6a87e0a47c5

    Affected versions

    rel/2.12.2
    rel/2.12.1
    rel/2.12.0

    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
    CVE-2021-45105 | CVE-DB