{"answers":{"affected":"13 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat. It affects 8 products.","exploited":"There is no known exploitation of CVE-2020-11996 in the wild and no public exploit code.","fix":"Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.0.0-M5, 8.5.55 or 9.0.35.","what":"CVE-2020-11996 is a high-severity denial of service vulnerability in Apache Tomcat, published on 26 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-11996 and fix it if it is affected.\n\nWhat it is: CVE-2020-11996 is a high-severity denial of service vulnerability in Apache Tomcat, published on 26 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-11996 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 10.0.0-M1; fixed in 10.0.0-M5\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 10.0.0-M1; fixed in 10.0.0-M5\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 8.5.0; fixed in 8.5.55\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 8.5.0; fixed in 8.5.55\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 9.0.0.M1; fixed in 9.0.35\n- org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 9.0.0.M1; fixed in 9.0.35\n- tomcat (Bitnami): affected from 8.5.0; fixed in 8.5.56, 9.0.36\n- org.apache.tomcat:tomcat (Maven): affected from 10.0.0-M1; fixed in 10.0.0-M5\n- org.apache.tomcat:tomcat (Maven): affected from 10.0.0-M1; fixed in 10.0.0-M5\n- org.apache.tomcat:tomcat (Maven): affected from 8.5.0; fixed in 8.5.55\n- org.apache.tomcat:tomcat (Maven): affected from 8.5.0; fixed in 8.5.55\n- org.apache.tomcat:tomcat (Maven): affected from 9.0.0.M1; fixed in 9.0.35\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2020-11996/ (Markdown: https://insights.sbomify.com/CVE-2020-11996/index.md)","id":"CVE-2020-11996","markdown":"https://insights.sbomify.com/CVE-2020-11996/index.md","name":"CVE-2020-11996","record":{"aliases":["BIT-tomcat-2020-11996","DEBIAN-CVE-2020-11996","GHSA-53hp-jpwq-2jgq","RHSA-2020:5170","SUSE-SU-2020:1841-1","SUSE-SU-2020:1962-1","SUSE-SU-2020:1963-1","SUSE-SU-2020:1983-1","UBUNTU-CVE-2020-11996","openSUSE-SU-2020:1051-1","openSUSE-SU-2020:1063-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Apache Tomcat","requires_auth":"none","summary":"Attackers can cause Apache Tomcat to become unresponsive by sending crafted HTTP/2 requests that trigger high CPU usage.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"apache","cpe":[{"product":"tomcat","vendor":"apache"},{"product":"ubuntu_linux","vendor":"canonical"},{"product":"debian_linux","vendor":"debian"},{"product":"oncommand_system_manager","vendor":"netapp"},{"product":"leap","vendor":"opensuse"},{"product":"mysql_enterprise_monitor","vendor":"oracle"},{"product":"siebel_ui_framework","vendor":"oracle"},{"product":"workload_manager","vendor":"oracle"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"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.","ecosystems":["Bitnami","Maven","Red Hat:jboss_enterprise_web_server:5.4::el6","Red Hat:jboss_enterprise_web_server:5.4::el7","Red Hat:jboss_enterprise_web_server:5.4::el8","SUSE:Linux Enterprise High Performance Computing 15-ESPOS","SUSE:Linux Enterprise High Performance Computing 15-LTSS","SUSE:Linux Enterprise Module for Web and Scripting 15 SP1","SUSE:Linux Enterprise Module for Web and Scripting 15 SP2","SUSE:Linux Enterprise Server 12 SP4-LTSS","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server 15-LTSS","SUSE:Linux Enterprise Server for SAP Applications 12 SP4","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 15","SUSE:OpenStack Cloud 9","SUSE:OpenStack Cloud Crowbar 9","openSUSE:Leap 15.1","openSUSE:Leap 15.2"],"exploits":{"exploitdb":0,"first_seen":"2020-07-27","github_poc":1,"max_poc_stars":5,"metasploit":0,"nuclei":0,"refs":[{"date":"2020-07-27T13:22:21Z","kind":"github_poc","ref":"https://github.com/rusakovichma/tomcat-embed-core-9.0.31-CVE-2020-11996","stars":5,"title":"tomcat-embed-core-9.0.31 CVE-2020-11996 Test PoC"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Uncontrolled Resource Consumption in Apache Tomcat","id":"CVE-2020-11996","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"apache:tomcat","products":["apache:tomcat","canonical:ubuntu_linux","debian:debian_linux","opensuse:leap","oracle:mysql_enterprise_monitor","oracle:siebel_ui_framework"],"type":"denial_of_service","year":"2020"},"n_packages":72,"n_references":24,"next":{"headline":"Information disclosure in Apache Guacamole","id":"CVE-2020-11997"},"packages":[{"ecosystem":"Bitnami","fixed":["8.5.56","9.0.36"],"introduced":["8.5.0","9.0.0"],"last_affected":[],"package":"tomcat","purl":"pkg:bitnami/tomcat","source":"BIT-tomcat-2020-11996"},{"ecosystem":"Maven","fixed":["10.0.0-M5"],"introduced":["10.0.0-M1"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["10.0.0-M5"],"introduced":["10.0.0-M1"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["8.5.55"],"introduced":["8.5.0"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["8.5.55"],"introduced":["8.5.0"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["9.0.35"],"introduced":["9.0.0.M1"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["9.0.35"],"introduced":["9.0.0.M1"],"last_affected":[],"package":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["10.0.0-M5"],"introduced":["10.0.0-M1"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["10.0.0-M5"],"introduced":["10.0.0-M1"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["8.5.55"],"introduced":["8.5.0"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["8.5.55"],"introduced":["8.5.0"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["9.0.35"],"introduced":["9.0.0.M1"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":null,"source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Maven","fixed":["9.0.35"],"introduced":["9.0.0.M1"],"last_affected":[],"package":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","source":"GHSA-53hp-jpwq-2jgq"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:3.4.1-1.Final_redhat_00001.1.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-jboss-logging","purl":"pkg:rpm/redhat/jws5-jboss-logging","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:1.4.2-7.Final_redhat_00002.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-mod_cluster","purl":"pkg:rpm/redhat/jws5-mod_cluster","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:1.4.2-7.Final_redhat_00002.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-mod_cluster-tomcat","purl":"pkg:rpm/redhat/jws5-mod_cluster-tomcat","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat","purl":"pkg:rpm/redhat/jws5-tomcat","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-admin-webapps","purl":"pkg:rpm/redhat/jws5-tomcat-admin-webapps","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-docs-webapp","purl":"pkg:rpm/redhat/jws5-tomcat-docs-webapp","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-el-3.0-api","purl":"pkg:rpm/redhat/jws5-tomcat-el-3.0-api","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-javadoc","purl":"pkg:rpm/redhat/jws5-tomcat-javadoc","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-jsp-2.3-api","purl":"pkg:rpm/redhat/jws5-tomcat-jsp-2.3-api","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-lib","purl":"pkg:rpm/redhat/jws5-tomcat-lib","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:1.2.25-2.redhat_2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-native","purl":"pkg:rpm/redhat/jws5-tomcat-native","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:1.2.25-2.redhat_2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-native-debuginfo","purl":"pkg:rpm/redhat/jws5-tomcat-native-debuginfo","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-selinux","purl":"pkg:rpm/redhat/jws5-tomcat-selinux","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-servlet-4.0-api","purl":"pkg:rpm/redhat/jws5-tomcat-servlet-4.0-api","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el6","fixed":["0:9.0.36-6.redhat_5.2.el6jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-webapps","purl":"pkg:rpm/redhat/jws5-tomcat-webapps","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:3.4.1-1.Final_redhat_00001.1.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-jboss-logging","purl":"pkg:rpm/redhat/jws5-jboss-logging","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:1.4.2-7.Final_redhat_00002.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-mod_cluster","purl":"pkg:rpm/redhat/jws5-mod_cluster","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:1.4.2-7.Final_redhat_00002.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-mod_cluster-tomcat","purl":"pkg:rpm/redhat/jws5-mod_cluster-tomcat","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat","purl":"pkg:rpm/redhat/jws5-tomcat","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-admin-webapps","purl":"pkg:rpm/redhat/jws5-tomcat-admin-webapps","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-docs-webapp","purl":"pkg:rpm/redhat/jws5-tomcat-docs-webapp","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-el-3.0-api","purl":"pkg:rpm/redhat/jws5-tomcat-el-3.0-api","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-javadoc","purl":"pkg:rpm/redhat/jws5-tomcat-javadoc","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-jsp-2.3-api","purl":"pkg:rpm/redhat/jws5-tomcat-jsp-2.3-api","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:9.0.36-6.redhat_5.2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-lib","purl":"pkg:rpm/redhat/jws5-tomcat-lib","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:1.2.25-2.redhat_2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-native","purl":"pkg:rpm/redhat/jws5-tomcat-native","source":"RHSA-2020:5170"},{"ecosystem":"Red Hat:jboss_enterprise_web_server:5.4::el7","fixed":["0:1.2.25-2.redhat_2.el7jws"],"introduced":["0"],"last_affected":[],"package":"jws5-tomcat-native-debuginfo","purl":"pkg:rpm/redhat/jws5-tomcat-native-debuginfo","source":"RHSA-2020:5170"}],"prev":{"headline":"Apache Dubbo default deserialization protocol Hessian2 cause CRE","id":"CVE-2020-11995"},"products":["Apache Tomcat"],"published":"2020-06-26","related":[{"cvss_score":10,"headline":"Apache Tomcat Path Equivalence","id":"CVE-2025-24813","kev_date_added":"2025-04-01","published":"2025-03-10"},{"cvss_score":9.8,"headline":"Apache Tomcat Remote Code Execution","id":"CVE-2016-8735","kev_date_added":"2023-05-12","published":"2017-04-06"},{"cvss_score":8.1,"headline":"Apache Tomcat Remote Code Execution","id":"CVE-2017-12617","kev_date_added":"2022-03-25","published":"2017-10-03"},{"cvss_score":8.1,"headline":"Apache Tomcat on Windows Remote Code Execution","id":"CVE-2017-12615","kev_date_added":"2022-03-25","published":"2017-09-19"},{"cvss_score":7.5,"headline":"Apache Tomcat Missing Encryption of Sensitive Data","id":"CVE-2026-34486","kev_date_added":"2026-08-04","published":"2026-04-09"},{"cvss_score":9.8,"headline":"Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete","id":"CVE-2026-65637","kev_date_added":null,"published":"2026-08-25"},{"cvss_score":9.8,"headline":"Apache Tomcat: Limited replay attack possible with DIGEST authentication","id":"CVE-2026-65905","kev_date_added":null,"published":"2026-08-25"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["Apache"]},"summary":"Attackers can cause Apache Tomcat to become unresponsive by sending crafted HTTP/2 requests that trigger high CPU usage.","url":"https://insights.sbomify.com/CVE-2020-11996/"}