{"id":"CVE-2023-45648","state":"PUBLISHED","title":"Apache Tomcat: Trailer header parsing too lenient","description":"Improper Input Validation vulnerability in Apache Tomcat.Tomcat 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 \ncrafted, invalid trailer header could cause Tomcat to treat a single \nrequest as multiple requests leading to the possibility of request \nsmuggling when behind a reverse proxy.\n\nOlder, EOL versions may also be affected.\n\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.","publishedAt":"2023-10-10T18:38:34.097Z","updatedAt":"2025-10-29T12:00:47.484Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"CISA-ADP"},"assigner":"apache","products":["Apache Software Foundation Apache Tomcat"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Tomcat","defaultStatus":"unaffected","versions":[{"version":"11.0.0-M1","status":"affected","lessThanOrEqual":"11.0.0-M11","versionType":"semver"},{"version":"10.1.0-M1","status":"affected","lessThanOrEqual":"10.1.13","versionType":"semver"},{"version":"9.0.0-M1","status":"affected","lessThanOrEqual":"9.0.81","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.93","versionType":"semver"},{"version":"3","status":"unknown","lessThan":"8.5.0","versionType":"semver"},{"version":"10.0.0-M1","status":"unknown","lessThanOrEqual":"10.0.27","versionType":"semver"}]}],"references":["https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp","http://www.openwall.com/lists/oss-security/2023/10/10/10","https://www.debian.org/security/2023/dsa-5522","https://www.debian.org/security/2023/dsa-5521","https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html","https://security.netapp.com/advisory/ntap-20231103-0007/"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:06:24.729Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/45xxx/CVE-2023-45648.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-45648","state":"PUBLISHED","datePublished":"2023-10-10T18:38:34.097Z","dateUpdated":"2025-10-29T12:00:47.484Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2023-10-10T11:31:15.664Z"},"containers":{"cna":{"title":"Apache Tomcat: Trailer header parsing too lenient","descriptions":[{"lang":"en","value":"Improper Input Validation vulnerability in Apache Tomcat.Tomcat 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 \ncrafted, invalid trailer header could cause Tomcat to treat a single \nrequest as multiple requests leading to the possibility of request \nsmuggling when behind a reverse proxy.\n\nOlder, EOL versions may also be affected.\n\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."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Tomcat","defaultStatus":"unaffected","versions":[{"version":"11.0.0-M1","status":"affected","lessThanOrEqual":"11.0.0-M11","versionType":"semver"},{"version":"10.1.0-M1","status":"affected","lessThanOrEqual":"10.1.13","versionType":"semver"},{"version":"9.0.0-M1","status":"affected","lessThanOrEqual":"9.0.81","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.93","versionType":"semver"},{"version":"3","status":"unknown","lessThan":"8.5.0","versionType":"semver"},{"version":"10.0.0-M1","status":"unknown","lessThanOrEqual":"10.0.27","versionType":"semver"}]}],"references":[{"url":"https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp","tags":["vendor-advisory"]}],"metrics":[{"other":{"content":{"text":"important"},"type":"Textual description of severity"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2025-10-29T12:00:47.484Z"},"credits":[{"lang":"en","type":"finder","value":"Keran Mu and Jianjun Chen from Tsinghua University and Zhongguancun Laboratory"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp","tags":["vendor-advisory","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2023/10/10/10","tags":["x_transferred"]},{"url":"https://www.debian.org/security/2023/dsa-5522","tags":["x_transferred"]},{"url":"https://www.debian.org/security/2023/dsa-5521","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html","tags":["x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20231103-0007/","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T20:21:16.919Z"}},{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"apache","product":"tomcat","defaultStatus":"unknown","versions":[{"version":"11.0.0-m1","status":"affected","lessThanOrEqual":"11.0.0-m11","versionType":"semver"},{"version":"10.1.0-m1","status":"affected","lessThanOrEqual":"10.1.13","versionType":"semver"},{"version":"9.0.0-m1","status":"affected","lessThanOrEqual":"9.0.81","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.93","versionType":"semver"}],"cpes":["cpe:2.3:a:apache:tomcat:-:*:*:*:*:*:*:*"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-06-16T16:59:12.136875Z","id":"CVE-2023-45648","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-08-21T13:49:43.621Z"}}]}}}