{"id":"CVE-2021-33037","revision":"325c470badbb4f6fa6d848126faed998","records":[{"revision":"325c470badbb4f6fa6d848126faed998","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-33037","aliases":[],"title":"Incorrect Transfer-Encoding handling with HTTP/1.0","description":"Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.","state":0,"publishedAt":"2021-07-12T14:55:15+00:00","modifiedAt":"2026-10-08T21:13:49.981+00:00","affected":[{"ecosystem":"Vendor product","name":"Apache Tomcat","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Apache Tomcat\",\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"Apache Tomcat 10 10.0.0-M1 to 10.0.6\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"Apache Tomcat 9 9.0.0.M1 to 9.0.46\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"Apache Tomcat 8 8.5.0 to 8.5.66\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://lists.apache.org/thread.html/r612a79269b0d5e5780c62dfd34286a8037232fec0bc6f1a7e60c9381%40%3Cannounce.tomcat.apache.org%3E","https://www.oracle.com//security-alerts/cpujul2021.html","https://lists.apache.org/thread.html/r40f921575aee8d7d34e53182f862c45cbb8f3d898c9d4e865c2ec262%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/re01e7e93154e8bdf78a11a23f9686427bd3d51fc6e12c508645567b7%40%3Ccommits.tomee.apache.org%3E","https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html","https://www.debian.org/security/2021/dsa-4952","https://lists.apache.org/thread.html/rd0dfea39829bc0606c936a16f6fca338127c86c0a1083970b45ac8d2%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/r290aee55b72811fd19e75ac80f6143716c079170c5671b96932ed44b%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/rf1b54fd3f52f998ca4829159a88cc4c23d6cef5c6447d00948e75c97%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/rc6ef52453bb996a98cb45442871a1db56b7c349939e45d829bf9ae37%40%3Ccommits.tomee.apache.org%3E","https://www.oracle.com/security-alerts/cpuoct2021.html","https://security.netapp.com/advisory/ntap-20210827-0007/","https://kc.mcafee.com/corporate/index?page=content&id=SB10366","https://www.oracle.com/security-alerts/cpujan2022.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://security.gentoo.org/glsa/202208-34"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-33037","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-33037","identifiers":["CVE-2021-33037"]},"retained":false,"historicalAffected":[]}],"coverage":[]}