{"id":"CVE-2021-42340","details":"The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 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":["BIT-tomcat-2021-42340","GHSA-wph7-x527-w3h5"],"modified":"2026-04-16T04:43:07.525247762Z","published":"2021-10-14T20:15:09.060Z","references":[{"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://www.debian.org/security/2021/dsa-5009"},{"type":"ADVISORY","url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10379"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211104-0001/"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"04d663d7541a013098db3a3f81b1c23c255c12a4"},{"fixed":"53c394049af76032bc7acab9de023013ad4fdc43"},{"introduced":"11cce490eb67a8aca64377a22c0cea2e38896725"},{"fixed":"454f804f3336ec980e84eb84bb6a051e349c6d3a"},{"introduced":"e4344b6bd67359e1690312674d83710a793f1d5b"},{"fixed":"84e18583f461778707f7fd2e25b1f0677e44e899"},{"introduced":"0"},{"last_affected":"9826be4c8368c94eab1e804b456867ca1cb766c3"},{"introduced":"0"},{"last_affected":"f2ab9ac8bc3f40ee9b2cb50b030c99df927f0429"},{"introduced":"0"},{"last_affected":"0e59fedb28df646930c5aff945159b64d7a52260"},{"introduced":"0"},{"last_affected":"8778a44d6323c1066237043a89ab2f36696916b1"},{"introduced":"0"},{"last_affected":"e706972942e2c342e4a37baf5e2596f11e8a0e94"},{"introduced":"0"},{"last_affected":"2a10c8d9110d7b1c7f526f3352648c6b19ba2c52"},{"introduced":"0"},{"last_affected":"56e547d387ab49f688c93fe9ca082b1b5d94deed"},{"introduced":"0"},{"last_affected":"16bf392c67833ad549733b58c350ff92b5ee782a"}],"database_specific":{"versions":[{"introduced":"8.5.60"},{"fixed":"8.5.72"},{"introduced":"9.0.40"},{"fixed":"9.0.54"},{"introduced":"10.0.1"},{"fixed":"10.0.12"},{"introduced":"0"},{"last_affected":"10.0.0-milestone10"},{"introduced":"0"},{"last_affected":"10.1.0-milestone1"},{"introduced":"0"},{"last_affected":"10.1.0-milestone2"},{"introduced":"0"},{"last_affected":"10.1.0-milestone3"},{"introduced":"0"},{"last_affected":"10.1.0-milestone4"},{"introduced":"0"},{"last_affected":"10.1.0-milestone5"},{"introduced":"0"},{"last_affected":"11.0"},{"introduced":"0"},{"last_affected":"9.0"}]}}],"versions":["10.0.0-M10","10.1.0-M1","10.1.0-M2","10.1.0-M3","10.1.0-M4","10.1.0-M5","11.0.0","9.0.0"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"6.2.1.0"}]},{"events":[{"introduced":"0"},{"fixed":"23.1"}]},{"events":[{"introduced":"8.0.0.0"},{"last_affected":"8.5.0.2"}]},{"events":[{"introduced":"0"},{"last_affected":"20.1.0"}]},{"events":[{"introduced":"0"},{"last_affected":"12.2.1.3.0"}]},{"events":[{"introduced":"0"},{"last_affected":"12.2.1.4.0"}]},{"events":[{"introduced":"0"},{"last_affected":"12.2.1.4.0"}]},{"events":[{"introduced":"0"},{"last_affected":"19.1"}]},{"events":[{"introduced":"0"},{"last_affected":"20.3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.0.2"}]},{"events":[{"introduced":"0"},{"last_affected":"16.0.2"}]},{"events":[{"introduced":"0"},{"last_affected":"15.0.2"}]},{"events":[{"introduced":"0"},{"last_affected":"16.0.2"}]},{"events":[{"introduced":"0"},{"last_affected":"21.0.0"}]},{"events":[{"introduced":"0"},{"last_affected":"16.0.1"}]},{"events":[{"introduced":"0"},{"last_affected":"19.0.0"}]},{"events":[{"introduced":"0"},{"last_affected":"14.0.4.13"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1.3.5"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1.3.14"}]},{"events":[{"introduced":"0"},{"last_affected":"15.0.3.3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.0.3.8"}]},{"events":[{"introduced":"0"},{"last_affected":"16.0.3.7"}]},{"events":[{"introduced":"0"},{"last_affected":"9.1"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42340.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}