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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
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
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
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
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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
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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