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CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack

Critical · CVSS 9.0 (CVSS 3.1)KEV known exploitedEPSS 100.0%, 100th percentilePublished Updated Assigner: apache

In CISA’s Known Exploited Vulnerabilities catalog: Apache Log4j2 Deserialization of Untrusted Data Vulnerability.

Added , federal remediation due . Known ransomware use: Known.

Required action: Apply updates per vendor instructions.

Description

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H · CWE-917

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Apache Software Foundation: Apache Log4j

References

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