{"schema_version":"1.7.5","id":"CVE-2021-43980","published":"2022-09-28T14:15:09.880Z","modified":"2026-07-08T05:57:42.216531849Z","aliases":["BIT-tomcat-2021-43980","GHSA-jx7c-7mj5-9438"],"related":["SUSE-SU-2022:4009-1","SUSE-SU-2022:4221-1","SUSE-SU-2022:4257-1","SUSE-SU-2026:1058-1","openSUSE-SU-2024:12534-1","openSUSE-SU-2024:13441-1"],"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"e37b977db6f47e4380ad67114a49e8568951c953"},{"last_affected":"3931695e564dd4dd1dbf029026e900b74992408c"},{"introduced":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"last_affected":"235730aed454e8d3619109f2c563587ff722e69d"},{"introduced":"4c8b650437e2464c1c31c6598a263b3805b7a81f"},{"last_affected":"70f59e8328621e58b9493c119f05a2e57f597a1c"},{"introduced":"f2ab9ac8bc3f40ee9b2cb50b030c99df927f0429"},{"last_affected":"02d546ba3c553c74ff1a99ecc166a6ff9c501ba8"}],"database_specific":{"cpe":["cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone1:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone10:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone11:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone12:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone2:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone3:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone4:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone5:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone6:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone7:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone8:*:*:*:*:*:*","cpe:2.3:a:apache:tomcat:10.1.0:milestone9:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.5.0"},{"last_affected":"8.5.77"},{"introduced":"9.0.0"},{"last_affected":"9.0.60"},{"introduced":"10.0.0"},{"last_affected":"10.0.18"},{"introduced":"10.1.0-milestone1"},{"last_affected":"10.1.0-milestone1"},{"introduced":"10.1.0-milestone10"},{"last_affected":"10.1.0-milestone10"},{"introduced":"10.1.0-milestone11"},{"last_affected":"10.1.0-milestone11"},{"introduced":"10.1.0-milestone12"},{"last_affected":"10.1.0-milestone12"},{"introduced":"10.1.0-milestone2"},{"last_affected":"10.1.0-milestone2"},{"introduced":"10.1.0-milestone3"},{"last_affected":"10.1.0-milestone3"},{"introduced":"10.1.0-milestone4"},{"last_affected":"10.1.0-milestone4"},{"introduced":"10.1.0-milestone5"},{"last_affected":"10.1.0-milestone5"},{"introduced":"10.1.0-milestone6"},{"last_affected":"10.1.0-milestone6"},{"introduced":"10.1.0-milestone7"},{"last_affected":"10.1.0-milestone7"},{"introduced":"10.1.0-milestone8"},{"last_affected":"10.1.0-milestone8"},{"introduced":"10.1.0-milestone9"},{"last_affected":"10.1.0-milestone9"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["10.1.0-milestone1","10.1.0-milestone10","10.1.0-milestone11","10.1.0-milestone12","10.1.0-milestone2","10.1.0-milestone3","10.1.0-milestone4","10.1.0-milestone5","10.1.0-milestone6","10.1.0-milestone7","10.1.0-milestone8","10.1.0-milestone9"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43980.json"}}],"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"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"10.0"},{"last_affected":"10.0"},{"introduced":"11.0"},{"last_affected":"11.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}