{"id":"BIT-tomcat-2021-42340","summary":"DoS via memory leak with WebSocket connections","details":"The fix for bug 63362 present in Apache Tomcat 10.1.0 to 10.1.0, 10.0.0 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.","aliases":["CVE-2021-42340","GHSA-wph7-x527-w3h5"],"modified":"2026-09-08T08:47:48.689422517Z","published":"2024-03-06T11:09:50.280Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10379"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3E"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-34"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211104-0001/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-5009"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42340"}],"affected":[{"package":{"name":"tomcat","ecosystem":"Bitnami","purl":"pkg:bitnami/tomcat"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.5.60"},{"fixed":"8.5.72"},{"introduced":"9.0.40"},{"fixed":"9.0.54"},{"introduced":"10.0.1"},{"fixed":"10.0.12"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/tomcat/BIT-tomcat-2021-42340.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}