May 1, 2023 · Applied Cybernetics Group
CVE-2021-45046 — Apache Log4j2
known ransomware use
Apache Log4j2 Deserialization of Untrusted Data Vulnerability
- Added to KEV
2023-05-01- Federal due date
2023-05-22- Vendor
- Apache
- Product
- Log4j2
- EPSS
- 100.0th percentile (score 1.000, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1059 , T1486 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-45046
CISA short description
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.
Required action
Apply updates per vendor instructions.