CVE-2021-44228

Known Exploited Public Exploit
Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

Description

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.

Categories

10.0
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 94.38% Top 5%
KEV Since 
Vendor Advisory cisco.com Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory microsoft.com Vendor Advisory fedoraproject.org Vendor Advisory apache.org
Affected: Apache Software Foundation Apache Log4j2
Published at:
Updated at:

References

Link Tags
https://logging.apache.org/log4j/2.x/security.html release notes vendor advisory
http://www.openwall.com/lists/oss-security/2021/12/10/1 mailing list third party advisory mitigation
http://www.openwall.com/lists/oss-security/2021/12/10/2 mailing list third party advisory mitigation
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd vendor advisory third party advisory
http://www.openwall.com/lists/oss-security/2021/12/10/3 mailing list third party advisory
https://security.netapp.com/advisory/ntap-20211210-0007/ third party advisory
http://packetstormsecurity.com/files/165225/Apache-Log4j2-2.14.1-Remote-Code-Execution.html vdb entry third party advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032 third party advisory
https://www.oracle.com/security-alerts/alert-cve-2021-44228.html third party advisory
https://www.debian.org/security/2021/dsa-5020 mailing list third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00007.html mailing list third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VU57UJDCFIASIO35GC55JMKSRXJMCDFM/ release notes vendor advisory
https://msrc-blog.microsoft.com/2021/12/11/microsofts-response-to-cve-2021-44228-apache-log4j2/ third party advisory patch vendor advisory
http://www.openwall.com/lists/oss-security/2021/12/13/2 mailing list third party advisory
http://www.openwall.com/lists/oss-security/2021/12/13/1 mailing list third party advisory
http://www.openwall.com/lists/oss-security/2021/12/14/4 mailing list third party advisory
https://www.kb.cert.org/vuls/id/930724 us government resource third party advisory
https://twitter.com/kurtseifried/status/1469345530182455296 third party advisory exploit broken link
https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf third party advisory
http://packetstormsecurity.com/files/165260/VMware-Security-Advisory-2021-0028.html vdb entry third party advisory
http://packetstormsecurity.com/files/165270/Apache-Log4j2-2.14.1-Remote-Code-Execution.html third party advisory vdb entry exploit
http://packetstormsecurity.com/files/165261/Apache-Log4j2-2.14.1-Information-Disclosure.html third party advisory vdb entry exploit
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html third party advisory
http://www.openwall.com/lists/oss-security/2021/12/15/3 mailing list third party advisory
http://packetstormsecurity.com/files/165282/Log4j-Payload-Generator.html vdb entry third party advisory
http://packetstormsecurity.com/files/165281/Log4j2-Log4Shell-Regexes.html vdb entry third party advisory
http://packetstormsecurity.com/files/165307/Log4j-Remote-Code-Execution-Word-Bypassing.html vdb entry third party advisory
http://packetstormsecurity.com/files/165311/log4j-scan-Extensive-Scanner.html third party advisory vdb entry broken link
http://packetstormsecurity.com/files/165306/L4sh-Log4j-Remote-Code-Execution.html vdb entry third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5CSVUNV4HWZZXGOKNSK6L7RPM7BOKIB/ release notes vendor advisory
http://packetstormsecurity.com/files/165371/VMware-Security-Advisory-2021-0028.4.html third party advisory vdb entry exploit
https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf third party advisory
https://www.oracle.com/security-alerts/cpujan2022.html patch third party advisory
http://packetstormsecurity.com/files/165532/Log4Shell-HTTP-Header-Injection.html third party advisory vdb entry exploit
https://github.com/cisagov/log4j-affected-db/blob/develop/SOFTWARE-LIST.md us government resource product broken link
http://packetstormsecurity.com/files/165642/VMware-vCenter-Server-Unauthenticated-Log4Shell-JNDI-Injection-Remote-Code-Execution.html third party advisory vdb entry exploit
http://packetstormsecurity.com/files/165673/UniFi-Network-Application-Unauthenticated-Log4Shell-Remote-Code-Execution.html third party advisory vdb entry exploit
http://seclists.org/fulldisclosure/2022/Mar/23 mailing list third party advisory
https://www.bentley.com/en/common-vulnerability-exposure/be-2022-0001 third party advisory
https://github.com/cisagov/log4j-affected-db third party advisory
https://support.apple.com/kb/HT213189 third party advisory
https://www.oracle.com/security-alerts/cpuapr2022.html patch third party advisory
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-44228 exploit third party advisory
https://www.nu11secur1ty.com/2021/12/cve-2021-44228.html exploit third party advisory
http://seclists.org/fulldisclosure/2022/Jul/11 mailing list third party advisory
http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html vdb entry third party advisory
http://packetstormsecurity.com/files/167917/MobileIron-Log4Shell-Remote-Command-Execution.html third party advisory vdb entry exploit
http://seclists.org/fulldisclosure/2022/Dec/2 mailing list third party advisory exploit
http://packetstormsecurity.com/files/171626/AD-Manager-Plus-7122-Remote-Code-Execution.html vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-44228?
CVE-2021-44228 has been scored as a critical severity vulnerability.
How to fix CVE-2021-44228?
To fix CVE-2021-44228, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-44228 being actively exploited in the wild?
It is confirmed that CVE-2021-44228 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~94% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-44228?
CVE-2021-44228 affects Apache Software Foundation Apache Log4j2.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.