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    6 vulnerabilities found for log4net by apache

    CVE-2026-40021 (GCVE-0-2026-40021)

    Vulnerability from nvd – Published: 2026-04-10 15:44 – Updated: 2026-04-10 17:35
    VLAI
    Title
    Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters
    Summary
    Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in MDC property keys and values, as well as the identity field that may carry attacker-influenced data. This causes an exception during serialization and the silent loss of the affected log event. An attacker who can influence any of these fields can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4net 3.3.0, which fixes this issue.
    Severity
    6.3 (Medium)
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    Apache Software Foundation Apache Log4net Affected: 0 , < 3.3.0 (nuget)
        cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Credits
    f00dat
    Show details on NVD website
    To clipboard 

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    CVE-2018-1285 (GCVE-0-2018-1285)

    Vulnerability from nvd – Published: 2020-05-11 16:41 – Updated: 2024-08-05 03:59
    VLAI
    Summary
    Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.
    Severity
    No CVSS data available.
    CWE
    • XXE
    Assigner
    References
    Impacted products
    Vendor Product Version
    n/a Apache log4net Affected: Apache log4net up to 2.0.8
    Show details on NVD website
    To clipboard 

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    CVE-2006-0743 (GCVE-0-2006-0743)

    Vulnerability from nvd – Published: 2006-03-09 20:00 – Updated: 2024-08-07 16:48
    VLAI
    Summary
    Format string vulnerability in LocalSyslogAppender in Apache log4net 1.2.9 might allow remote attackers to cause a denial of service (memory corruption and termination) via unknown vectors.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    URL Tags
    http://secunia.com/advisories/22932 third-party-advisoryx_refsource_SECUNIA
    http://www.vupen.com/english/advisories/2006/0955 vdb-entryx_refsource_VUPEN
    http://secunia.com/advisories/19241 third-party-advisoryx_refsource_SECUNIA
    http://www.novell.com/linux/security/advisories/2… vendor-advisoryx_refsource_SUSE
    http://issues.apache.org/jira/browse/LOG4NET-67 x_refsource_CONFIRM
    http://www.osvdb.org/23905 vdb-entryx_refsource_OSVDB
    https://exchange.xforce.ibmcloud.com/vulnerabilit… vdb-entryx_refsource_XF
    http://www.securityfocus.com/bid/17095 vdb-entryx_refsource_BID
    Date Public
    2006-03-09 00:00
    Show details on NVD website
    To clipboard 

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    CVE-2026-40021 (GCVE-0-2026-40021)

    Vulnerability from cvelistv5 – Published: 2026-04-10 15:44 – Updated: 2026-04-10 17:35
    VLAI
    Title
    Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters
    Summary
    Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.html#layout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in MDC property keys and values, as well as the identity field that may carry attacker-influenced data. This causes an exception during serialization and the silent loss of the affected log event. An attacker who can influence any of these fields can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4net 3.3.0, which fixes this issue.
    Severity
    6.3 (Medium)
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    Apache Software Foundation Apache Log4net Affected: 0 , < 3.3.0 (nuget)
        cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Credits
    f00dat
    Show details on NVD website
    To clipboard 

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}

    CVE-2018-1285 (GCVE-0-2018-1285)

    Vulnerability from cvelistv5 – Published: 2020-05-11 16:41 – Updated: 2024-08-05 03:59
    VLAI
    Summary
    Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.
    Severity
    No CVSS data available.
    CWE
    • XXE
    Assigner
    References
    Impacted products
    Vendor Product Version
    n/a Apache log4net Affected: Apache log4net up to 2.0.8
    Show details on NVD website
    To clipboard 

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    CVE-2006-0743 (GCVE-0-2006-0743)

    Vulnerability from cvelistv5 – Published: 2006-03-09 20:00 – Updated: 2024-08-07 16:48
    VLAI
    Summary
    Format string vulnerability in LocalSyslogAppender in Apache log4net 1.2.9 might allow remote attackers to cause a denial of service (memory corruption and termination) via unknown vectors.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    URL Tags
    http://secunia.com/advisories/22932 third-party-advisoryx_refsource_SECUNIA
    http://www.vupen.com/english/advisories/2006/0955 vdb-entryx_refsource_VUPEN
    http://secunia.com/advisories/19241 third-party-advisoryx_refsource_SECUNIA
    http://www.novell.com/linux/security/advisories/2… vendor-advisoryx_refsource_SUSE
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    http://www.osvdb.org/23905 vdb-entryx_refsource_OSVDB
    https://exchange.xforce.ibmcloud.com/vulnerabilit… vdb-entryx_refsource_XF
    http://www.securityfocus.com/bid/17095 vdb-entryx_refsource_BID
    Date Public
    2006-03-09 00:00
    Show details on NVD website
    To clipboard 

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