{"schema_version":"1.7.5","id":"CVE-2020-17527","published":"2020-12-03T19:15:12.200Z","modified":"2026-07-08T05:56:34.233773624Z","aliases":["BIT-tomcat-2020-17527","GHSA-vvw4-rfwf-p6hx"],"related":["SUSE-SU-2021:0031-1","SUSE-SU-2021:0040-1","SUSE-SU-2021:0041-1","SUSE-SU-2021:0042-1","SUSE-SU-2026:1058-1","openSUSE-SU-2021:0043-1","openSUSE-SU-2021:0081-1","openSUSE-SU-2024:11468-1","openSUSE-SU-2024:13441-1"],"details":"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"389365303d986b2a918bc95f39421b27a2c9ff30"},{"last_affected":"c042ec71219dbde3e1ce0381ce5be0801120d0fa"},{"introduced":"3c78e95e36268dfb76db1570f0cf49104fa6eabc"},{"last_affected":"fc2c65d390444d75412855ad0de8b878018d02dc"},{"introduced":"10e04de1946981261a734507f4a6d953e2a206fe"},{"last_affected":"6f143d19d151620cd0bfe9ec2ffa429e36ad0e45"}],"database_specific":{"cpe":["cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*","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: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: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:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.36:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.37:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.38:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:9.0.39:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone1:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone2:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone3:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone4:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone5:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone6:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone7:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone8:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.0.0:milestone9:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.5.1"},{"last_affected":"8.5.59"},{"introduced":"9.0.1"},{"last_affected":"9.0.35"},{"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-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-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"},{"introduced":"9.0.36"},{"last_affected":"9.0.36"},{"introduced":"9.0.37"},{"last_affected":"9.0.37"},{"introduced":"9.0.38"},{"last_affected":"9.0.38"},{"introduced":"9.0.39"},{"last_affected":"9.0.39"},{"introduced":"10.0.0-milestone1"},{"last_affected":"10.0.0-milestone1"},{"introduced":"10.0.0-milestone2"},{"last_affected":"10.0.0-milestone2"},{"introduced":"10.0.0-milestone3"},{"last_affected":"10.0.0-milestone3"},{"introduced":"10.0.0-milestone4"},{"last_affected":"10.0.0-milestone4"},{"introduced":"10.0.0-milestone5"},{"last_affected":"10.0.0-milestone5"},{"introduced":"10.0.0-milestone6"},{"last_affected":"10.0.0-milestone6"},{"introduced":"10.0.0-milestone7"},{"last_affected":"10.0.0-miles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