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High severity7.5NVD Advisory· Published Dec 14, 2021· Updated May 28, 2026

CVE-2021-4104

CVE-2021-4104

Description

JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
log4j:log4jMaven
>= 1.2.0, <= 1.2.17—
org.zenframework.z8.dependencies.commons:log4j-1.2.17Maven
<= 2.0—

Affected products

175

Patches

Vulnerability mechanics

References

17

News mentions

0

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