Critical 10.0
KEV + Ransomware
CVE-2021-44228
Log4Shell Zero-Day Vulnerability Exploitation in Apache Log4j 2 (CVE-2021-44228)
Vendor / product: Apache Log4j 2
Event date: 2021-12-09
Public PoC: Yes
First tracked by RiskWire: 2026-09-17
CISA KEV catalog
Added to KEV
Federal remediation due
2021-12-24 (1731 days overdue)
Ransomware campaign use
Known
CISA description
Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.
Required action
For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.
Sources & citations (1)
- How Log4Shell Works: Breaking Down CVE-2021-44228 dev.to · 2026-09-17
References
See CVE-2021-44228 in context
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