{"id":"CVE-2020-1935","details":"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.","aliases":["BIT-tomcat-2020-1935","GHSA-qxf4-chvg-4r8r"],"modified":"2026-04-10T04:24:09.089197Z","published":"2020-02-24T22:15:11.980Z","related":["CGA-j6hw-gf79-vc9x","MGASA-2020-0138","SUSE-SU-2020:0598-1","SUSE-SU-2020:0631-1","SUSE-SU-2020:0632-1","SUSE-SU-2020:2611-1","openSUSE-SU-2020:0345-1","openSUSE-SU-2024:11468-1","openSUSE-SU-2024:13441-1"],"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4680"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4448-1/"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20200327-0005/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4673"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"e498667bd7811e846771a852b16ce9f1e524b81b"},{"last_affected":"a94a0258f36d064aa032608a9e99c62018f22d94"},{"introduced":"e37b977db6f47e4380ad67114a49e8568951c953"},{"last_affected":"c40ede65ea4fb44b1957ec482f28c7afa71f1b50"},{"introduced":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"last_affected":"4fab4cc012d0c31852e957d198cb0549f3d6074c"},{"introduced":"0"},{"last_affected":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"introduced":"0"},{"last_affected":"29b07def810d335012e738b22ab44d4e232b50d1"},{"introduced":"0"},{"last_affected":"10e04de1946981261a734507f4a6d953e2a206fe"},{"introduced":"0"},{"last_affected":"65ddc3a3872ea41ca67fec7b6834c704b6893361"},{"introduced":"0"},{"last_affected":"b5a74e3c7913c560648f0ffedfbbb3ebe4318def"},{"introduced":"0"},{"last_affected":"de128d72af746184e035ff1b53629f08cb141a04"},{"introduced":"0"},{"last_affected":"aac670afe1226e10513021100fce8a12344743c6"},{"introduced":"0"},{"last_affected":"c2c8107f0cea4755497a85990807b883b66f6b57"},{"introduced":"0"},{"last_affected":"8c48678b110f3fbbe66f6dde0e45d2578fa92c29"},{"introduced":"0"},{"last_affected":"9c5edb840d9413c1408e7c191bc0e1bbfcd9e07f"},{"introduced":"0"},{"last_affected":"59e713216cf2256aacc54f6ba627865f356f9e4e"},{"introduced":"0"},{"last_affected":"7dc5e29fe49850102261badf158752d6865311e4"},{"introduced":"0"},{"last_affected":"18b014d8691909be6153ae7db022a6c35f9c93ea"},{"introduced":"0"},{"last_affected":"600dc8ba5d9be7599d29bff83c342213d93b034e"},{"introduced":"0"},{"last_affected":"3bd48aab236e5bf0ed1644e9f0c588fd20e503ab"},{"introduced":"0"},{"last_affected":"642d3dd4d50ea1f03f9827962e4fc982a123bb78"},{"introduced":"0"},{"last_affected":"24566c02fb917a6ca1b6479a60971b0d8acd895c"},{"introduced":"0"},{"last_affected":"cac0e029dcced854eeca7444710e78e412dc2c2a"},{"introduced":"0"},{"last_affected":"c5efed313de1a181f4f9f98f5023117f3b911257"},{"introduced":"0"},{"last_affected":"ab04166fac59fcf9b3be3aab1c8b896842782d4c"},{"introduced":"0"},{"last_affected":"35071e7e52f296b9187b054b0efd74121b7db3bd"},{"introduced":"0"},{"last_affected":"d1dc05e934e089ea8907998cf850760017a0ed82"},{"introduced":"0"},{"last_affected":"fd7f13635e6855f6ba3fead0bf37ba2fbf8b68cf"},{"introduced":"0"},{"last_affected":"c7b84102600d600bcc527560d9c4d10c3fd440ab"},{"introduced":"0"},{"last_affected":"d8ebf61e51b4455e3c22675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