CVE-2021-4104 Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2

2021-12-1400:00:00

CWE-502

apache

www.cve.org

8.9 High

AI Score

Confidence

High

0.975 High

EPSS

Percentile

100.0%

JSON

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.

CNA Affected

[
  {
    "vendor": "Apache Software Foundation",
    "product": "Apache Log4j 1.x",
    "versions": [
      {
        "version": "Apache Log4j 1.2 1.2.x",
        "status": "affected"
      }
    ]
  }
]