{"id":"CVE-2023-45648","aliases":["BIT-tomcat-2023-45648","GHSA-r6j3-px5g-cq3x"],"url":"https://o3.security/vulnerability/CVE-2023-45648","summary":"Apache Tomcat: Trailer header parsing too lenient","details":"Improper Input Validation vulnerability in Apache Tomcat.\n\nTomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single \nrequest as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.","published":"2023-10-10T18:38:34.097Z","modified":"2026-08-12T03:51:24.934929004Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"11.0.0-M12"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.1.14"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"9.0.81"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"8.5.94"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"11.0.0-M12"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"10.1.14"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"9.0.81"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"8.5.94"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"11.0.0-M12"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"10.1.14"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"9.0.81"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"8.5.94"}],"fix":{"url":"https://github.com/apache/tomcat/commit/59583245639d8c42ae0009f4a4a70464d3ea70a0","label":"apache/tomcat@5958324"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/10/10/10"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45648.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-45648"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20231103-0007/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5521"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5522"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/59583245639d8c42ae0009f4a4a70464d3ea70a0"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/8ecff306507be8e4fd3adee1ae5de1ea6661a8f4"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/c83fe47725f7ae9ae213568d9039171124fb7ec6"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/eb5c094e5560764cda436362254997511a3ca1f6"},{"type":"PACKAGE","url":"https://github.com/apache/tomcat"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20231103-0007"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:24.934929004Z"}}