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.
https://www.zerodayinitiative.com/advisories/ZDI-21-1541/
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.kb.cert.org/vuls/id/930724
https://www.debian.org/security/2021/dsa-5024
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
https://security.netapp.com/advisory/ntap-20211218-0001/
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
https://www.tenable.com/blog/frequently-asked-questions-about-iranian-cyber-operations
https://www.tenable.com/blog/oracle-january-2022-critical-patch-update-addresses-266-cves
https://github.com/arpitgupta369/log4shell-scanner
https://github.com/zebbern/pocmap
https://github.com/prafull97-lab/Cybersecurity-Vulnerability-Risk-Analysis
https://github.com/Hector-Abarca/realrisk-checks
https://github.com/cognis-digital/sbomb
https://github.com/kaleth4/CVE-2021-44228
https://github.com/urunsiyabend/depintel
https://github.com/marvang/vuln-variants
https://github.com/rebugui/open-cve-scanner
https://github.com/yksanjo/vuln-mcp-server
https://github.com/B1ack4sh/Blackash-CVE-2021-44228
https://github.com/arabindadora/log4shell
https://github.com/ozGod-sh/Declencheur-CVE
https://github.com/binkley/modern-java-practices
https://github.com/demonrvm/Log4ShellRemediation
https://github.com/demining/Log4j-Vulnerability
https://github.com/advisories/GHSA-v57x-gxfj-484q
https://github.com/advisories/GHSA-3qpm-h9ch-px3c
https://github.com/sakuraji-labs/log4j-remediation
https://github.com/hackername0102/log4j
https://github.com/tejas-nagchandi/CVE-2021-45105
https://github.com/advisories/GHSA-p6xc-xr62-6r2g
https://github.com/andalik/log4j-filescan
https://github.com/HynekPetrak/log4shell-finder
https://github.com/fox-it/log4j-finder