{"schema_version":"1.7.5","id":"CVE-2020-1935","published":"2020-02-24T22:15:11.980Z","modified":"2026-08-07T08:11:51.618271791Z","aliases":["BIT-tomcat-2020-1935","GHSA-qxf4-chvg-4r8r"],"related":["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"],"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.","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"},{"last_affected":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"introduced":"29b07def810d335012e738b22ab44d4e232b50d1"},{"last_affected":"45f8fd74cdb96490fab8709263a4d862f0d429cf"}],"database_specific":{"cpe":["cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:-:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone3:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone4:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone6:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone7:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone8:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.0:milestone9:*:*:*:*:*:*"],"extracted_events":[{"introduced":"7.0.0"},{"last_affected":"7.0.99"},{"introduced":"8.5.0"},{"last_affected":"8.5.50"},{"introduced":"9.0.0"},{"last_affected":"9.0.30"},{"introduced":"9.0.0-NA"},{"last_affected":"9.0.0-NA"},{"introduced":"9.0.0-milestone1"},{"last_affected":"9.0.0-milestone1"},{"introduced":"9.0.0-milestone10"},{"last_affected":"9.0.0-milestone10"},{"introduced":"9.0.0-milestone11"},{"last_affected":"9.0.0-milestone11"},{"introduced":"9.0.0-milestone12"},{"last_affected":"9.0.0-milestone12"},{"introduced":"9.0.0-milestone13"},{"last_affected":"9.0.0-milestone13"},{"introduced":"9.0.0-milestone14"},{"last_affected":"9.0.0-milestone14"},{"introduced":"9.0.0-milestone15"},{"last_affected":"9.0.0-milestone15"},{"introduced":"9.0.0-milestone16"},{"last_affected":"9.0.0-milestone16"},{"introduced":"9.0.0-milestone17"},{"last_affected":"9.0.0-milestone17"},{"introduced":"9.0.0-milestone18"},{"last_affected":"9.0.0-milestone18"},{"introduced":"9.0.0-milestone19"},{"last_affected":"9.0.0-milestone19"},{"introduced":"9.0.0-milestone2"},{"last_affected":"9.0.0-milestone2"},{"introduced":"9.0.0-milestone20"},{"last_affected":"9.0.0-milestone20"},{"introduced":"9.0.0-milestone21"},{"last_affected":"9.0.0-milestone21"},{"introduced":"9.0.0-milestone22"},{"last_affected":"9.0.0-milestone22"},{"introduced":"9.0.0-milestone23"},{"last_affected":"9.0.0-milestone23"},{"introduced":"9.0.0-milestone24"},{"last_affected":"9.0.0-milestone24"},{"introduced":"9.0.0-milestone25"},{"last_affected":"9.0.0-milestone25"},{"introduced":"9.0.0-milestone26"},{"last_affected":"9.0.0-milestone26"},{"introduced":"9.0.0-milestone27"},{"last_affected":"9.0.0-milestone27"},{"introduced":"9.0.0-milestone3"},{"last_affected":"9.0.0-milestone3"},{"introduced":"9.0.0-milestone4"},{"last_affected":"9.0.0-milestone4"},{"introduced":"9.0.0-milestone5"},{"last_affected":"9.0.0-milestone5"},{"introduced":"9.0.0-milestone6"},{"last_affected":"9.0.0-milestone6"},{"introduced":"9.0.0-milestone7"},{"last_affected":"9.0.0-milestone7"},{"introduced":"9.0.0-milestone8"},{"last_affected":"9.0.0-milestone8"},{"introduced":"9.0.0-milestone9"},{"last_affected":"9.0.0-milestone9"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["9.0.0-milestone1","9.0.0-milestone10","9.0.0-milestone11","9.0.0-milestone12","9.0.0-milestone13","9.0.0-milestone14","9.0.0-milestone15","9.0.0-milestone16","9.0.0-milestone17","9.0.0-milestone18","9.0.0-milestone19","9.0.0-milestone2","9.0.0-milestone20","9.0.0-milestone21","9.0.0-milestone22","9.0.0-milestone23","9.0.0-milestone24","9.0.0-milestone25","9.0.0-milestone26","9.0.0-milestone27","9.0.0-milestone3","9.0.0-milestone4","9.0.0-milestone5","9.0.0-milestone6","9.0.0-milestone7","9.0.0-milestone8","9.0.0-milestone9","9.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-1935.json"}}],"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/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":"WEB","url":"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E"},{"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://security.netapp.com/advisory/ntap-20200327-0005/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4448-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4673"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4680"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:a:netapp:oncommand_system_manager:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.0.0"},{"last_affected":"3.1.3"}],"source":"CPE_RANGE","vendor_product":"netapp:oncommand_system_manager"},{"cpes":["cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"17.1"},{"last_affected":"17.3"}],"source":"CPE_RANGE","vendor_product":"oracle:instantis_enterprisetrack"},{"cpes":["cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"4.0.0"},{"last_affected":"4.0.12"},{"introduced":"8.0.0"},{"last_affected":"8.0.20"}],"source":"CPE_RANGE","vendor_product":"oracle:mysql_enterprise_monitor"},{"cpes":["cpe:2.3:a:oracle:siebel_ui_framework:*:*:*:*:*:*:*:*"],"extracted_events":[{"last_affected":"20.5"}],"source":"CPE_RANGE","vendor_product":"oracle:siebel_ui_framework"},{"cpes":["cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*"],"extracted_events":[{"introduced":"16.04"},{"last_affected":"16.04"}],"source":"CPE_STRING","vendor_product":"canonical:ubuntu_linux"},{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.0"},{"last_affected":"8.0"},{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"},{"cpes":["cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"15.1"},{"last_affected":"15.1"}],"source":"CPE_STRING","vendor_product":"opensuse:leap"},{"cpes":["cpe:2.3:a:oracle:agile_engineering_data_management:6.2.1.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"6.2.1.0"},{"last_affected":"6.2.1.0"}],"source":"CPE_STRING","vendor_product":"oracle:agile_engineering_data_management"},{"cpes":["cpe:2.3:a:oracle:agile_product_lifecycle_management:9.3.3:*:*:*:*:*:*:*","cpe:2.3:a:oracle:agile_product_lifecycle_management:9.3.5:*:*:*:*:*:*:*","cpe:2.3:a:oracle:agile_product_lifecycle_management:9.3.6:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"9.3.3"},{"last_affected":"9.3.3"},{"introduced":"9.3.5"},{"last_affected":"9.3.5"},{"introduced":"9.3.6"},{"last_affected":"9.3.6"}],"source":"CPE_STRING","vendor_product":"oracle:agile_product_lifecycle_management"},{"cpes":["cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:*","cpe:2.3:a:oracle:communications_element_manager:8.2.0:*:*:*:*:*:*:*","cpe:2.3:a:oracle:communications_element_manager:8.2.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduce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