{"id":"CVE-2020-11996","details":"A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.","aliases":["BIT-tomcat-2020-11996","GHSA-53hp-jpwq-2jgq"],"modified":"2026-05-18T05:50:51.889910342Z","published":"2020-06-26T17:15:10.153Z","related":["SUSE-SU-2020:1841-1","SUSE-SU-2020:1962-1","SUSE-SU-2020:1963-1","SUSE-SU-2020:1983-1","openSUSE-SU-2020:1051-1","openSUSE-SU-2020:1063-1","openSUSE-SU-2024:11468-1","openSUSE-SU-2024:13441-1"],"database_specific":{"unresolved_ranges":[{"vendor_product":"canonical:ubuntu_linux","extracted_events":[{"last_affected":"20.04"}],"cpes":["cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"debian:debian_linux","extracted_events":[{"last_affected":"9.0"},{"last_affected":"10.0"}],"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"netapp:oncommand_system_manager","extracted_events":[{"last_affected":"3.0"},{"last_affected":"3.1.3"}],"cpes":["cpe:2.3:a:netapp:oncommand_system_manager:3.0:*:*:*:*:*:*:*","cpe:2.3:a:netapp:oncommand_system_manager:3.1.3:*:*:*:*:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"opensuse:leap","extracted_events":[{"last_affected":"15.1"},{"last_affected":"15.2"}],"cpes":["cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*","cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"oracle:mysql_enterprise_monitor","extracted_events":[{"last_affected":"8.0.21"}],"cpes":["cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"oracle:siebel_ui_framework","extracted_events":[{"last_affected":"20.12"}],"cpes":["cpe:2.3:a:oracle:siebel_ui_framework:*:*:*:*:*:*:*:*"],"source":"CPE_FIELD"},{"vendor_product":"oracle:workload_manager","extracted_events":[{"last_affected":"12.2.0.1"},{"last_affected":"18c"},{"last_affected":"19c"}],"cpes":["cpe:2.3:a:oracle:workload_manager:12.2.0.1:*:*:*:*:*:*:*","cpe:2.3:a:oracle:workload_manager:18c:*:*:*:*:*:*:*","cpe:2.3:a:oracle:workload_manager:19c:*:*:*:*:*:*:*"],"source":"CPE_FIELD"}]},"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/r2529016c311ce9485e6f173446d469600fdfbb94dccadfcd9dfdac79%40%3Cusers.tomcat.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r3ea96d8f36dd404acce83df8aeb22a9e807d6c13ca9c5dec72f872cd%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r5a4f80a6acc6607d61dae424b643b594c6188dd4e1eff04705c10db2%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r6c29801370a36c1a5159679269777ad0c73276d3015b8bbefea66e5c%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r74f5a8204efe574cbfcd95b2a16236fe95beb45c4d9fee3dc789dca9%40%3Ccommits.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8f3d416c193bc9384a8a7dd368623d441f5fcaff1057115008100561%40%3Ccommits.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r93ca628ef3a4530dfe5ac49fddc795f0920a4b2a408b57a30926a42b%40%3Ccommits.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r9ad911fe49450ed9405827af0e7a74104041081ff91864b1f2546bbd%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f5853e2760%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rb4ee49ecc4c59620ffd5e66e84a17e526c2c3cfa95d0cd682d90d338%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rb820f1a2a02bf07414be12c653c2ab5321fd87b9bf6c5e635c53ff4b%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rc80b96b4b96618b2b7461cb90664a428cfd6605eea9f74e51b792542%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rea65d6ef2e45dd1c45faae83922042732866c7b88fa109b76c83db52%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/ref0339792ac6dac1dba83c071a727ad72380899bde60f6aaad4031b9%40%3Cnotifications.ofbiz.apache.org%3E"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00064.html"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00072.html"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20200709-0002/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4596-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4727"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"e37b977db6f47e4380ad67114a49e8568951c953"},{"last_affected":"c8a57e4a2db8e5af314bae48123fb5990da5b7a5"},{"introduced":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"last_affected":"fc2c65d390444d75412855ad0de8b878018d02dc"},{"introduced":"0"},{"last_affected":"29b07def810d335012e738b22ab44d4e232b50d1"},{"last_affected":"10e04de1946981261a734507f4a6d953e2a206fe"},{"last_affected":"65ddc3a3872ea41ca67fec7b6834c704b6893361"},{"last_affected":"b5a74e3c7913c560648f0ffedfbbb3ebe4318def"},{"last_affected":"de128d72af746184e035ff1b53629f08cb141a04"},{"last_affected":"aac670afe1226e10513021100fce8a12344743c6"},{"last_affected":"c2c8107f0cea4755497a85990807b883b66f6b57"},{"last_affected":"8c48678b110f3fbbe66f6dde0e45d2578fa92c29"},{"last_affected":"9c5edb840d9413c1408e7c191bc0e1bbfcd9e07f"},{"last_affected":"59e713216cf2256aacc54f6ba627865f356f9e4e"},{"last_affected":"7dc5e29fe49850102261badf158752d6865311e4"},{"last_affected":"18b014d8691909be6153ae7db022a6c35f9c93ea"},{"last_affected":"600dc8ba5d9be7599d29bff83c342213d93b034e"},{"last_affected":"3bd48aab236e5bf0ed1644e9f0c588fd20e503ab"},{"last_affected":"642d3dd4d50ea1f03f9827962e4fc982a123bb78"},{"last_affected":"24566c02fb917a6ca1b6479a60971b0d8acd895c"},{"last_affected":"cac0e029dcced854eeca7444710e78e412dc2c2a"},{"last_affected":"c5efed313de1a181f4f9f98f5023117f3b911257"},{"last_affected":"ab04166fac59fcf9b3be3aab1c8b896842782d4c"},{"last_affected":"35071e7e52f296b9187b054b0efd74121b7db3bd"},{"last_affected":"d1dc05e934e089ea8907998cf850760017a0ed82"},{"last_affected":"fd7f13635e6855f6ba3fead0bf37ba2fbf8b68cf"},{"last_affected":"c7b84102600d600bcc527560d9c4d10c3fd440ab"},{"last_affected":"d8ebf61e51b4455e3c226751e492a533f9002d48"},{"last_affected":"aba238718ac9b149d25feaa9a14ecad3b0e3a5e2"},{"last_affected":"fe854ab1f111396458d98fa2ab08c693ce9407e1"},{"last_affected":"45f8fd74cdb96490fab8709263a4d862f0d429cf"},{"last_affected":"b0b074b683ed2e09ff9e9755825bfce83d303a93"},{"last_affected":"d971ce1bdf8b8e8de93fb41454f4ce2e815ee936"},{"last_affected":"eb684224706fe1d8ef5610c8d79dc403e1038393"},{"last_affected":"772df65db45cfccc2aad33b9b51ef9ab14c19626"},{"last_affected":"b3a208c6d6d01c553178c5e718e750b0eb318151"}],"database_specific":{"extracted_events":[{"introduced":"8.5.0"},{"last_affected":"8.5.55"},{"introduced":"9.0.0"},{"last_affected":"9.0.35"},{"introduced":"0"},{"last_affected":"9.0.0-milestone1"},{"last_affected":"9.0.0-milestone10"},{"last_affected":"9.0.0-milestone11"},{"last_affected":"9.0.0-milestone12"},{"last_affected":"9.0.0-milestone13"},{"last_affected":"9.0.0-milestone14"},{"last_affected":"9.0.0-milestone15"},{"last_affected":"9.0.0-milestone16"},{"last_affected":"9.0.0-milestone17"},{"last_affected":"9.0.0-milestone18"},{"last_affected":"9.0.0-milestone19"},{"last_affected":"9.0.0-milestone2"},{"last_affected":"9.0.0-milestone20"},{"last_affected":"9.0.0-milestone21"},{"last_affected":"9.0.0-milestone22"},{"last_affected":"9.0.0-milestone23"},{"last_affected":"9.0.0-milestone24"},{"last_affected":"9.0.0-milestone25"},{"last_affected":"9.0.0-milestone26"},{"last_affected":"9.0.0-milestone27"},{"last_affected":"9.0.0-milestone3"},{"last_affected":"9.0.0-milestone4"},{"last_affected":"9.0.0-milestone5"},{"last_affected":"9.0.0-milestone6"},{"last_affected":"9.0.0-milestone7"},{"last_affected":"9.0.0-milestone8"},{"last_affected":"9.0.0-milestone9"},{"last_affected":"10.0.0-milestone1"},{"last_affected":"10.0.0-milestone2"},{"last_affected":"10.0.0-milestone3"},{"last_affected":"10.0.0-milestone4"},{"last_affected":"10.0.0-milestone5"}],"cpe":["cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*","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:*:*:*:*:*:*","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:*:*:*:*:*:*"],"source":"CPE_FIELD"}}],"versions":["8.5.55","9.0.35","10.0.0-M5","10.0.0-M4","10.0.0-M3","10.0.0-M2","10.0.0-M1","9.0.0-M27","9.0.0-M26","9.0.0-M25","9.0.0-M24","9.0.0-M23","9.0.0-M22","9.0.0-M21","9.0.0-M20","9.0.0-M19","9.0.0-M18","9.0.0-M17","9.0.0-M16","9.0.0-M15","9.0.0-M14","9.0.0-M13","9.0.0-M12","9.0.0-M11","9.0.0-M10","9.0.0-M9","9.0.0-M8","9.0.0-M7","9.0.0-M6","9.0.0-M5","9.0.0-M4","9.0.0-M3","9.0.0-M2","9.0.0-M1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-11996.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}