{"id":"CVE-2021-43980","aliases":["BIT-tomcat-2021-43980","GHSA-jx7c-7mj5-9438"],"url":"https://o3.security/vulnerability/CVE-2021-43980","summary":"Apache Tomcat Race Condition vulnerability","details":"The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.","published":"2022-09-28T14:15:09.880Z","modified":"2026-07-08T05:57:42.216531849Z","cvss":{"score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"8.5.78"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"9.0.62"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.0.20"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.1.0-M14"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2022/09/28/1"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5265"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:57:42.216531849Z"}}