Apache Log4j2 Deserialization of Untrusted Data Vulnerability (CVE-2021-45046)
Severity: critical · Patch status: patched · Since 2023-05-01 · CVE-2021-45046
Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations. CISA added CVE-2021-45046 to its Known Exploited Vulnerabilities catalog on May 1, 2023, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by May 22, 2023 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
