ACTIVELY EXPLOITED
CVE-2021-44228: Apache Log4j2 Remote Code Execution Vulnerability
| Vendor | Apache |
|---|---|
| Product | Log4j2 |
| Actively exploited | Yes |
| Added to CISA KEV | 10 Dec 2021 |
| CISA federal deadline | 24 Dec 2021 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-20, CWE-400, CWE-502 |
Required action (CISA's text)
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.
Description (NVD)
Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.
SOURCES
Other Apache flaws
- CVE-2016-3081: Apache Struts Command Injection Vulnerability
- CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
- CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability
- CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability
- CVE-2025-24813: Apache Tomcat Path Equivalence Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.