CVE-2021-45046

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

• CWE-917
• CWE-917

• http://www.openwall.com/lists/oss-security/2021/12/14/4Mailing List, Mitigation, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/12/15/3Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/12/18/1Mailing List, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdfThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/Mailing List, Release Notes
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/Mailing List, Release Notes
• https://logging.apache.org/log4j/2.x/security.htmlMitigation, Release Notes, Vendor Advisory
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
• https://security.gentoo.org/glsa/202310-16Third Party Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
• https://www.cve.org/CVERecord?id=CVE-2021-44228Not Applicable
• https://www.debian.org/security/2021/dsa-5022Third Party Advisory
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.htmlThird Party Advisory
• https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
• https://www.oracle.com/security-alerts/alert-cve-2021-44228.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
• http://www.openwall.com/lists/oss-security/2021/12/14/4Mailing List, Mitigation, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/12/15/3Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/12/18/1Mailing List, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdfThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/Mailing List, Release Notes
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/Mailing List, Release Notes
• https://logging.apache.org/log4j/2.x/security.htmlMitigation, Release Notes, Vendor Advisory
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
• https://security.gentoo.org/glsa/202310-16Third Party Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
• https://www.cve.org/CVERecord?id=CVE-2021-44228Not Applicable
• https://www.debian.org/security/2021/dsa-5022Third Party Advisory
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.htmlThird Party Advisory
• https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
• https://www.oracle.com/security-alerts/alert-cve-2021-44228.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlThird Party Advisory
• https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-45046US Government Resource

Published

Dec 14, 2021

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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