{"id":"CVE-2020-1935","revision":null,"records":[{"revision":"fd116064ab014e078afb3ae6d5fe25bb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2020-1935","aliases":[],"title":"In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Re…","description":"In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.","state":0,"publishedAt":"2020-02-24T21:11:38+00:00","modifiedAt":"2026-10-08T21:03:23.185+00:00","affected":[{"ecosystem":"Vendor product","name":"Apache Tomcat","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Apache Tomcat\",\n                    \"vendor\": \"Apache\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"Apache Tomcat 9.0.0.M1 to 9.0.30\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.5.0 to 8.5.50\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"7.0.0 to 7.0.99\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E","https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html","http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html","https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E","https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E","https://www.debian.org/security/2020/dsa-4673","https://www.debian.org/security/2020/dsa-4680","https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html","https://www.oracle.com/security-alerts/cpujul2020.html","https://security.netapp.com/advisory/ntap-20200327-0005/","https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E","https://usn.ubuntu.com/4448-1/","https://www.oracle.com/security-alerts/cpuoct2020.html","https://www.oracle.com/security-alerts/cpujan2021.html","https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2020-1935","license":"CVE Program Terms of Use","key":"cve-program:CVE-2020-1935","identifiers":["CVE-2020-1935"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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