CVE-2021-45105

Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.

• CWE-20
• CWE-674
• CWE-20
• CWE-674

• https://www.openwall.com/lists/oss-security/2021/12/19/1Mailing List, Mitigation, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfThird Party Advisory
• https://logging.apache.org/log4j/2.x/security.htmlRelease Notes, Vendor Advisory
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211218-0001/Third Party Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
• https://www.debian.org/security/2021/dsa-5024Third Party Advisory
• https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third 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.zerodayinitiative.com/advisories/ZDI-21-1541/Third Party Advisory, VDB Entry
• https://www.openwall.com/lists/oss-security/2021/12/19/1Mailing List, Mitigation, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfThird Party Advisory
• https://logging.apache.org/log4j/2.x/security.htmlRelease Notes, Vendor Advisory
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211218-0001/Third Party Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
• https://www.debian.org/security/2021/dsa-5024Third Party Advisory
• https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third 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.zerodayinitiative.com/advisories/ZDI-21-1541/Third Party Advisory, VDB Entry

Published

Dec 18, 2021

Last Modified

Aug 25, 2026

Status

Modified

• 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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