CVE DATABASE / CVE-2021-44228

CVE-2021-44228

Apache Log4j2 Remote Code Execution Vulnerability

CVSS 10 · CRITICAL ⚠ CISA KEV — ACTIVELY EXPLOITED RANSOMWARE

On the CISA KEV catalog

Confirmed exploited in the wild. Added 2021-12-10. Federal remediation due 2021-12-24.
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.

Summary

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 3.1 breakdown

Base score	10 (CRITICAL)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector	NETWORK
Attack complexity	LOW
Privileges required	NONE
User interaction	NONE
Scope	CHANGED
Confidentiality	HIGH
Integrity	HIGH
Availability	HIGH

Weakness type (CWE)

Affected products

Siemens 6bk1602-0aa12-0tp0 firmwareSiemens 6bk1602-0aa12-0tp0Siemens 6bk1602-0aa22-0tp0 firmwareSiemens 6bk1602-0aa22-0tp0Siemens 6bk1602-0aa32-0tp0 firmwareSiemens 6bk1602-0aa32-0tp0Siemens 6bk1602-0aa42-0tp0 firmwareSiemens 6bk1602-0aa42-0tp0Siemens 6bk1602-0aa52-0tp0 firmwareSiemens 6bk1602-0aa52-0tp0Apache log4jSiemens sppa-t3000 ses3000 firmwareSiemens sppa-t3000 ses3000Siemens capitalSiemens comosSiemens desigo cc advanced reportsSiemens desigo cc info centerSiemens e-car operation centerSiemens energy engageSiemens energyip

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References

Data: NIST NVD + CISA KEV. NVD last modified 2026-02-20. Always verify against the vendor advisory before acting.