TLP:CLEARKNOWN EXPLOITEDAnalyzedPublished 10 Dec 2021 · Updated 11 Aug 2026
CVE-2021-44228
10.0CriticalCVSS 3.1
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.
- Affected software
- Apache Log4j2
- Versions
- 2.0-beta9 up to log4j-core*
- Weakness
- CWE-20 · Improper input validation
- Assigned by
- Apache
- Known exploited since
- 10 Dec 2021 (CISA KEV)
- NVD status
- Analyzed
ReferencesNVD https://nvd.nist.gov/vuln/detail/CVE-2021-44228 CVE.org https://www.cve.org/CVERecord?id=CVE-2021-44228 Mailing List http://www.openwall.com/lists/oss-security/2021/12/10/1Mailing List http://www.openwall.com/lists/oss-security/2021/12/10/2Release Notes https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5CSVUNV4HWZZXGOKNSK6L7RPM7BOKIB/Release Notes https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VU57UJDCFIASIO35GC55JMKSRXJMCDFM/Release Notes https://logging.apache.org/log4j/2.x/security.html