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...

References

• http://www.openwall.com/lists/oss-security/2021/12/19/1
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
• https://logging.apache.org/log4j/2.x/security.html
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
• https://security.netapp.com/advisory/ntap-20211218-0001/
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
• https://www.debian.org/security/2021/dsa-5024
• https://www.kb.cert.org/vuls/id/930724
• https://www.oracle.com/security-alerts/cpuapr2022.html

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