{"id":"CVE-2020-13934","aliases":["BIT-tomcat-2020-13934","GHSA-vf77-8h7g-gghp"],"url":"https://o3.security/vulnerability/CVE-2020-13934","summary":"Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat","details":"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.","published":"2020-07-14T15:15:11.007Z","modified":"2026-08-27T11:46:32.172479467Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.0.0-M6"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"9.0.36"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"8.5.56"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"10.0.0-M6"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"9.0.36"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"8.5.56"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20200724-0003/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4596-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2020/dsa-4727"},{"type":"FIX","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuApr2021.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T11:46:32.172479467Z"}}