{"cve":"CVE-2020-13935","nvd":{"published":"2020-07-14T15:15:11.070","modified":"2026-10-08T21:17:22.660","status":"Modified","description":"The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-835"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html","https://kc.mcafee.com/corporate/index?page=content&id=SB10332","https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E","https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E"],"products":["apache:tomcat","canonical:ubuntu_linux","debian:debian_linux","mcafee:epolicy_orchestrator","netapp:oncommand_system_manager","opensuse:leap","oracle:agile_engineering_data_management","oracle:agile_product_lifecycle_management","oracle:blockchain_platform","oracle:commerce_guided_search","oracle:communications_cloud_native_core_policy","oracle:communications_instant_messaging_server","oracle:fmw_platform","oracle:instantis_enterprisetrack","oracle:managed_file_transfer","oracle:mysql_enterprise_monitor","oracle:siebel_ui_framework","oracle:workload_manager"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-13935","score":0.86608,"percentile":0.99737,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-m7jv-hq7h-mq7c","url":"https://osv.dev/vulnerability/GHSA-m7jv-hq7h-mq7c","summary":"Infinite Loop in Apache Tomcat","modified":"2026-08-26T01:18:35.514741429Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=10.0.0-M1 <10.0.0-M7"],"fixed":["10.0.0-M7"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=9.0.0.M1 <9.0.37"],"fixed":["9.0.37"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=8.5.0 <8.5.57"],"fixed":["8.5.57"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=7.0.27 <7.0.105"],"fixed":["7.0.105"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-websocket","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-websocket","ranges":[">=7.0.27 <7.0.105"],"fixed":["7.0.105"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-websocket","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-websocket","ranges":[">=8.5.0 <8.5.57"],"fixed":["8.5.57"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-websocket","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-websocket","ranges":[">=9.0.0.M1 <9.0.37"],"fixed":["9.0.37"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-websocket","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-websocket","ranges":[">=10.0.0-M1 <10.0.0-M7"],"fixed":["10.0.0-M7"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-websocket","purl":"pkg:maven/org.apache.tomcat/tomcat-websocket","ranges":[">=10.0.0-M1 <10.0.0-M7"],"fixed":["10.0.0-M7"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-websocket","purl":"pkg:maven/org.apache.tomcat/tomcat-websocket","ranges":[">=9.0.0.M1 <9.0.37"],"fixed":["9.0.37"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-websocket","purl":"pkg:maven/org.apache.tomcat/tomcat-websocket","ranges":[">=8.5.0 <8.5.57"],"fixed":["8.5.57"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-websocket","purl":"pkg:maven/org.apache.tomcat/tomcat-websocket","ranges":[">=7.0.27 <7.0.105"],"fixed":["7.0.105"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}