CVE-2021-4104 vulnerability in Apache and Other Products
Published on December 14, 2021
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.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2021-4104 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2021-4104
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Affected Versions
Apache Software Foundation Apache Log4j 1.x Version Apache Log4j 1.2 1.2.x is affected by CVE-2021-4104Vulnerable Packages
The following package name and versions may be associated with CVE-2021-4104
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | ru.yandex.clickhouse:clickhouse-jdbc-bridge | < 2.0.7 | 2.0.7 |
Exploit Probability
EPSS
72.20%
Percentile
98.71%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.