{"id":"GHSA-p6xc-xr62-6r2g","summary":"Apache Log4j2 vulnerable to Improper Input Validation and Uncontrolled Recursion","details":"Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3) 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 and 2.12.3.\n\n\n# Affected packages\nOnly the `org.apache.logging.log4j:log4j-core` package is directly affected by this vulnerability. The `org.apache.logging.log4j:log4j-api` should be kept at the same version as the `org.apache.logging.log4j:log4j-core` package to ensure compatability if in use.","aliases":["CVE-2021-45105"],"modified":"2026-06-09T10:30:15.359158246Z","published":"2021-12-18T18:00:07Z","database_specific":{"cwe_ids":["CWE-20","CWE-674"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2021-12-18T17:59:37Z","nvd_published_at":"2021-12-18T12:15:00Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45105"},{"type":"WEB","url":"https://www.zerodayinitiative.com/advisories/ZDI-21-1541"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.kb.cert.org/vuls/id/930724"},{"type":"WEB","url":"https://www.debian.org/security/2021/dsa-5024"},{"type":"WEB","url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20211218-0001"},{"type":"WEB","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd"},{"type":"WEB","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032"},{"type":"WEB","url":"https://logging.apache.org/log4j/2.x/security.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00017.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2021/12/19/1"}],"affected":[{"package":{"name":"org.apache.logging.log4j:log4j-core","ecosystem":"Maven","purl":"pkg:maven/org.apache.logging.log4j/log4j-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.0"},{"fixed":"2.12.3"}]}],"versions":["2.10.0","2.11.0","2.11.1","2.11.2","2.12.0","2.12.1","2.12.2","2.4","2.4.1","2.5","2.6","2.6.1","2.6.2","2.7","2.8","2.8.1","2.8.2","2.9.0","2.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.apache.logging.log4j:log4j-core","ecosystem":"Maven","purl":"pkg:maven/org.apache.logging.log4j/log4j-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.13.0"},{"fixed":"2.17.0"}]}],"versions":["2.13.0","2.13.1","2.13.2","2.13.3","2.14.0","2.14.1","2.15.0","2.16.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.apache.logging.log4j:log4j-core","ecosystem":"Maven","purl":"pkg:maven/org.apache.logging.log4j/log4j-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.1"}]}],"versions":["2.0","2.0-alpha1","2.0-alpha2","2.0-beta1","2.0-beta2","2.0-beta3","2.0-beta4","2.0-beta5","2.0-beta6","2.0-beta7","2.0-beta8","2.0-beta9","2.0-rc1","2.0-rc2","2.0.1","2.0.2","2.1","2.2","2.3"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.ops4j.pax.logging:pax-logging-log4j2","ecosystem":"Maven","purl":"pkg:maven/org.ops4j.pax.logging/pax-logging-log4j2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.8.0"},{"fixed":"1.9.2"}]}],"versions":["1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5","1.8.6","1.8.7","1.9.0","1.9.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.ops4j.pax.logging:pax-logging-log4j2","ecosystem":"Maven","purl":"pkg:maven/org.ops4j.pax.logging/pax-logging-log4j2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.10.9"}]}],"versions":["1.10.0","1.10.1","1.10.2","1.10.3","1.10.4","1.10.5","1.10.6","1.10.7","1.10.8"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.ops4j.pax.logging:pax-logging-log4j2","ecosystem":"Maven","purl":"pkg:maven/org.ops4j.pax.logging/pax-logging-log4j2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.11.0"},{"fixed":"1.11.12"}]}],"versions":["1.11.0","1.11.1","1.11.10","1.11.11","1.11.2","1.11.3","1.11.4","1.11.5","1.11.6","1.11.7","1.11.8","1.11.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}},{"package":{"name":"org.ops4j.pax.logging:pax-logging-log4j2","ecosystem":"Maven","purl":"pkg:maven/org.ops4j.pax.logging/pax-logging-log4j2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.0.13"}]}],"versions":["2.0.0","2.0.1","2.0.10","2.0.11","2.0.12","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-p6xc-xr62-6r2g/GHSA-p6xc-xr62-6r2g.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"}]}