CVE-2021-44228

As of 2026-02-20, CVE-2021-44228 is a CVSS 10 (CRITICAL-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 94.4%. Threadlinqs Intelligence tracks 2 threats exploiting it.

Last updated: 2026-02-20

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-20, CWE-400, CWE-502, CWE-917

Exploitation status

CISA KEV-listed (known exploited)

Threats tracking this CVE

• Aquatic Panda (Earth Lusca) APT - Log4Shell Exploitation and Multi-Platform Backdoor Campaigns Targeting 17 Countries — CRITICAL
• APT41/Silver Dragon Expanding Enterprise Attack Surface — Google Drive C2, AppDomain Hijacking, Cloud/Supply Chain Targeting — HIGH

References

• http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/165260/VMware-Security-Advisory-2021-0028.html
• http://packetstormsecurity.com/files/165261/Apache-Log4j2-2.14.1-Information-Disclosure.html
• http://packetstormsecurity.com/files/165270/Apache-Log4j2-2.14.1-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/165281/Log4j2-Log4Shell-Regexes.html
• http://packetstormsecurity.com/files/165282/Log4j-Payload-Generator.html
• http://packetstormsecurity.com/files/165306/L4sh-Log4j-Remote-Code-Execution.html
• http://packetstormsecurity.com/files/165307/Log4j-Remote-Code-Execution-Word-Bypassing.html
• http://packetstormsecurity.com/files/165311/log4j-scan-Extensive-Scanner.html
• http://packetstormsecurity.com/files/165371/VMware-Security-Advisory-2021-0028.4.html

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.