{"id":"CVE-2021-42550","aliases":["GHSA-668q-qrv7-99fm"],"url":"https://o3.security/vulnerability/CVE-2021-42550","summary":"Deserialization of Untrusted Data in logback","details":"In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.","published":"2021-12-16T19:15:08.297Z","modified":"2026-10-24T10:30:19.783166116Z","cvss":{"score":6.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":3,"affectedPackages":[{"ecosystem":"Maven","name":"ch.qos.logback:logback-core","fixedVersion":"1.2.9"}],"fix":{"url":"https://github.com/qos-ch/logback/commit/87291079a1de9369ac67e20dc70a8fdc7cc4359c","label":"qos-ch/logback@8729107"},"references":[{"type":"ADVISORY","url":"http://logback.qos.ch/news.html"},{"type":"ADVISORY","url":"http://seclists.org/fulldisclosure/2022/Jul/11"},{"type":"ADVISORY","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-371761.pdf"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211229-0001/"},{"type":"FIX","url":"https://jira.qos.ch/browse/LOGBACK-1591"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/167794/Open-Xchange-App-Suite-7.10.x-Cross-Site-Scripting-Command-Injection.html"},{"type":"EVIDENCE","url":"https://github.com/cn-panda/logbackRceDemo"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42550"},{"type":"WEB","url":"https://github.com/qos-ch/logback/commit/87291079a1de9369ac67e20dc70a8fdc7cc4359c"},{"type":"WEB","url":"https://github.com/qos-ch/logback/commit/ef4fc4186b74b45ce80d86833820106ff27edd42"},{"type":"PACKAGE","url":"https://github.com/qos-ch/logback"},{"type":"WEB","url":"https://github.com/qos-ch/logback/blob/1502cba4c1dfd135b2e715bc0cf80c0045d4d128/logback-site/src/site/pages/news.html"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20211229-0001"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:30:19.783166116Z"}}