{"cve":"CVE-2020-13934","nvd":{"published":"2020-07-14T15:15:11.007","modified":"2026-10-08T22:16:56.700","status":"Modified","description":"An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading 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-401","CWE-476"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html","https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E","https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E","https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html"],"products":["apache:tomcat","canonical:ubuntu_linux","debian:debian_linux","netapp:oncommand_system_manager","opensuse:leap","oracle:agile_engineering_data_management","oracle:agile_product_lifecycle_management","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-2020-13934","score":0.64124,"percentile":0.99222,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vf77-8h7g-gghp","url":"https://osv.dev/vulnerability/GHSA-vf77-8h7g-gghp","summary":"Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat","modified":"2026-05-20T19:00:24.796492724Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=10.0.0-M1 <10.0.0-M6"],"fixed":["10.0.0-M6"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=9.0.0.M5 <9.0.36"],"fixed":["9.0.36"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","purl":"pkg:maven/org.apache.tomcat/tomcat","ranges":[">=8.5.1 <8.5.56"],"fixed":["8.5.56"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=10.0.0-M1 <10.0.0-M6"],"fixed":["10.0.0-M6"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=9.0.0.M5 <9.0.36"],"fixed":["9.0.36"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.5.1 <8.5.56"],"fixed":["8.5.56"]}]}],"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."]}