CVE-2021-4104
high-risk
Published 2021-12-14
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.
Do I need to act?
!
69.3% chance of exploitation in next 30 days
EPSS score — higher than 31% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ HIGH complexity
Affected Products (20)
Codeready Studio
Integration Camel Quarkus
Affected Vendors
References (28)
and 8 more references
69
/ 100
high-risk
Severity
22/34 · High
Exploitability
19/34 · Moderate
Exposure
28/34 · Critical