{"id":"CVE-2021-25122","aliases":["BIT-tomcat-2021-25122","CLSA-2023-1687469807","CLSA-2025-1748282295","DEBIAN-CVE-2021-25122","DLA-2594-1","DSA-4891-1","EUVD-2021-1340","GHSA-j39c-c8hj-x4j3","MGASA-2021-0357","OESA-2021-1117","RHSA-2021:2561","ROOT-APP-MAVEN-CVE-2021-25122","SUSE-SU-2021:0988-1","SUSE-SU-2021:0989-1","SUSE-SU-2021:1008-1","SUSE-SU-2021:1009-1","SUSE-SU-2026:1058-1","UBUNTU-CVE-2021-25122","USN-5360-1","USN-6943-1","openSUSE-SU-2021:0496-1","openSUSE-SU-2024:11468-1","openSUSE-SU-2024:13441-1"],"status":"published","title":"Apache Tomcat h2c request mix-up","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.18114,"percentile":0.9724,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2021-03-01T12:00:20Z","modified":"2026-10-24T10:30:55Z","fixes":[{"ecosystem":"Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","fixed_in":["8.5.63","10.0.2","9.0.43"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"org.apache.tomcat:tomcat-coyote","fixed_in":["10.0.2"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"tomcat","fixed_in":["8.5.62","9.0.42","10.0.1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"tomcat9","fixed_in":["9.0.43-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"tomcat9","fixed_in":["9.0.43-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"tomcat9","fixed_in":["9.0.43-1"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"io.root.org.apache.tomcat.embed:tomcat-embed-core","fixed_in":["9.0.39-root.io.1","9.0.39-root.io.2","9.0.39-root.io.3","9.0.39-root.io.4","9.0.39-root.io.5"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","fixed_in":["9.0.39-aikido.4","9.0.39-aikido.5"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"tomcat9","fixed_in":["9.0.16-3ubuntu0.18.04.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"tomcat8","fixed_in":["8.5.39-1ubuntu1~18.04.3+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"tomcat9","fixed_in":["9.0.31-1ubuntu0.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.5.0"},{"fixed":"8.5.63"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0-M1"},{"fixed":"10.0.2"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat.embed:tomcat-embed-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0-M1"},{"fixed":"9.0.43"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.tomcat:tomcat-coyote","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.0.0-M1"},{"fixed":"10.0.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"tomcat","ranges":[{"type":"SEMVER","events":[{"introduced":"8.5.0"},{"fixed":"8.5.62"},{"introduced":"9.0.0"},{"fixed":"9.0.42"},{"introduced":"10.0.0"},{"fixed":"10.0.1"}]}]},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"libtomcat8-embed-java","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"libtomcat8-java","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-admin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-docs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-examples","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-user","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+tuxcare.els2"}]}],"bundled":2},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"libtomcat8-embed-java","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.100-1ubuntu1~18.04.1+tuxcare.els1"}]}],"bundled":34},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"libtomcat8-java","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.100-1ubuntu1~18.04.1+tuxcare.els1"}]}],"bundled":34},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.100-1ubuntu1~18.04.1+tuxcare.els1"}]}],"bundled":34},{"source":"osv","ecosystem":"TuxCare:Ubuntu:18.04","package":"tomcat8-admin","r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l":"https://www.suse.com/support/update/announcement/2021/suse-su-20211009-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261058-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1216182","tags":["report"]},{"url":"https://bugzilla.suse.com/1243895","tags":["report"]},{"url":"https://bugzilla.suse.com/1246318","tags":["report"]},{"url":"https://bugzilla.suse.com/1246389","tags":["report"]},{"url":"https://bugzilla.suse.com/1258371","tags":["report"]},{"url":"https://bugzilla.suse.com/1258385","tags":["report"]},{"url":"https://bugzilla.suse.com/1259224","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13934","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13935","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13943","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-17527","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-30640","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-33037","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-41079","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-43980","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-23181","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-42252","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-24998","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-28708","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-28709","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-41080","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-42795","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-44487","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-45468","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-46589","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-21733","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-23672","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-24549","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-34750","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-38286","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-50379","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-52316","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-54677","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-24813","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-31651","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-46701","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-48988","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-48989","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-49125","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-52434","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-52520","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-53506","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-55752","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-55754","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-61795","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-66614","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-24733","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-25122","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5360-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-6943-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-9484","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-13943","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-17527","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-25329","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-30640","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-33037","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-41079","tags":["report"]},{"url":"https://bugs.launchpad.net/ubuntu/+source/tomcat9/+bug/1915911","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-23181","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-29885","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8745","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-12617","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5647","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5648","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5664","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-11784","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1336","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-8014","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-8034","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-8037","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-0199","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-0221","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-10072","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12418","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-17563","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-17569","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11996","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-1935","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-1938","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-9484","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-1976","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-0050","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5174","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5345","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5346","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5351","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-0706","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-0714","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-0763","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-3092","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-45143","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-25122","title":"Apache Tomcat h2c request mix-up","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:00:20Z","modified":"2026-10-08T21:13:48.044Z","cwes":["CWE-200"],"updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-1340","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:00:20Z","modified":"2026-10-08T21:13:48Z","updated_at":"2026-11-02T17:27:26.856493Z"}],"ghsa":[{"id":"GHSA-j39c-c8hj-x4j3","title":"Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-06-16T17:45:29Z","modified":"2026-08-25T18:31:35Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:41:05.994358Z"}],"nvd":[{"id":"CVE-2021-25122","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:15:13.793Z","modified":"2026-10-08T22:17:08.263Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:06:50.399901Z"}],"osv":[{"id":"CVE-2021-25122","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:15:13.793Z","modified":"2026-10-24T10:30:55.420225731Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25122","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:15:13.793Z","modified":"2026-10-09T09:47:27.727928206Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"GHSA-j39c-c8hj-x4j3","title":"Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-06-16T17:45:29Z","modified":"2026-08-26T01:21:18.074879844Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:46:49.977351Z"},{"id":"OESA-2021-1117","title":"tomcat security update","description":"The Apache Tomcat software is developed in an open and participatory environment and released under the Apache License version 2. The Apache Tomcat project is intended to be a collaboration of the best-of-breed developers from around the world. We invite you to participate in this open development project\r\n\r\nSecurity Fix(es):\r\n\r\nThe fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.(CVE-2021-25329)\r\n\r\nWhen responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A\u0026apos;s request.(CVE-2021-25122)","status":"published","published":"2021-04-07T11:04:21Z","modified":"2026-08-18T01:15:22.970618722Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:2561","title":"Red Hat Security Advisory: Red Hat JBoss Web Server 5.5.0 Security release","status":"published","published":"2024-09-22T17:05:13Z","modified":"2026-10-02T10:01:23Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"UBUNTU-CVE-2021-25122","description":"When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2021-03-01T12:15:00Z","modified":"2026-02-04T03:39:46.328261Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"BIT-tomcat-2021-25122","title":"Apache Tomcat h2c request mix-up","description":"When responding to new h2c connection requests, Apache Tomcat versions 9.0.0 through 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.","status":"published","published":"2024-03-06T11:10:22.561Z","modified":"2026-09-08T08:48:20.776322995Z","updated_at":"2026-11-02T15:28:36.104787Z"},{"id":"CLSA-2023-1687469807","title":"Fix CVE(s): CVE-2021-41079, CVE-2021-25122","description":"\n   * SECURITY UPDATE: Apache Tomcat h2c request mix-up\n     - debian/patches/CVE-2021-25122.patch: Simplify the code and fix an\n       edge case for BZ 64830\n     - CVE-2021-25122\n   * SECURITY UPDATE: Denial of Service for NIO+OpenSSL or NIO2+OpenSSL TLS\n       configurations\n     - debian/patches/CVE-2021-41079.patch: Improve robustness\n     - CVE-2021-41079","status":"published","published":"2023-06-22T21:36:52Z","modified":"2026-06-04T10:03:19.492199726Z","updated_at":"2026-11-02T15:43:40.509998Z"},{"id":"CLSA-2025-1748282295","title":"Fix of 34 CVEs","description":"   * SECURITY UPDATE: Misc vulnerability fixes\n     - CVE-2019-12418, CVE-2019-17563, CVE-2020-1935,\n       CVE-2020-11996, CVE-2020-13934, CVE-2020-13935,\n       CVE-2020-13943, CVE-2020-17527, CVE-2021-24122,\n       CVE-2021-30639, CVE-2021-30640, CVE-2021-33037,\n       CVE-2021-42340, CVE-2021-43980, CVE-2022-25762,\n       CVE-2022-34305, CVE-2022-45143, CVE-2023-24998,\n       CVE-2023-28709, CVE-2023-34981, CVE-2023-42794,\n       CVE-2024-21733\n   * Update to 8.5.100\n     - debian/rules,\n       debian/libtomcat8-java.poms,\n       debian/maven.rules,\n       debian/tomcat8-common.links,\n       debian/patches/0018-fix-manager-webapp.patch,\n       debian/patches/0019-add-distribution-to-error-page.patch,\n       debian/patches/0021-dont-test-unsupported-ciphers.patch,\n       debian/patches/0101-skipping-tests-incompatible-with-firewall.patch:\n       updated\n     - debian/patches/0002-do-not-load-AJP13-connector-by-default.patch,\n       debian/patches/0026-easymock4-compatibility.patch:\n       removed as they were applied in upstream\n     - CVE-2019-0221.patch, CVE-2019-10072-1.patch,\n       CVE-2019-10072-2.patch, CVE-2022-42252.patch,\n       CVE-2020-1938.patch, CVE-2021-25122.patch,\n       CVE-2021-41079.patch, CVE-2022-29885.patch,\n       CVE-2020-9484.patch, CVE-2021-25329-pre1.patch,\n       CVE-2021-25329.patch, CVE-2022-23181.patch,\n       CVE-2023-44487.patch, CVE-2023-46589-pre1.patch,\n       CVE-2023-46589-pre2.patch, CVE-2023-46589-pre3.patch,\n       CVE-2023-46589-pre4.patch, CVE-2023-46589.patch:\n       removed because these CVEs were fixed in upstream\n   * Internal tests\n     - debian/test_certs/*: updated from upstream branch 9.0.x, as the\n       8.0.x certs were expired","status":"published","published":"2025-05-27T13:45:18Z","modified":"2026-06-04T10:03:30.412984079Z","updated_at":"2026-11-02T15:43:41.66212Z"},{"id":"DLA-2594-1","title":"tomcat8 - security update","status":"published","published":"2021-03-15T00:00:00Z","modified":"2026-03-09T01:18:50.829161Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4891-1","title":"tomcat9 - security update","status":"published","published":"2021-04-13T00:00:00Z","modified":"2026-03-09T02:10:14.247815Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0357","title":"Updated tomcat packages fix security vulnerabilities","description":"When responding to new h2c connection requests, Apache Tomcat versions \n9.0.0.M1 to 9.0.41 could duplicate request headers and a limited amount of\nrequest body from one request to another meaning user A and user B could both\nsee the results of user A's request (CVE-2021-25122).\n\nThe fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 9.0.0.M1 to\n9.0.41 with a configuration edge case that was highly unlikely to be used, the\nTomcat instance was still vulnerable to CVE-2020-9494 (CVE-2021-25329).\n","status":"published","published":"2021-07-20T10:46:47Z","modified":"2026-04-16T04:42:28.014310143Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0496-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\nCVE-2021-25122: Apache Tomcat h2c request mix-up (bsc#1182912)\nCVE-2021-25329: Complete fix for CVE-2020-9484 (bsc#1182909)\n\nThis update was imported from the SUSE:SLE-15-SP2:Update update project.","status":"published","published":"2021-04-02T07:22:05Z","modified":"2026-02-04T03:53:18.946306Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2024:11468-1","title":"tomcat-9.0.36-8.4 on GA media","description":"These are all security issues fixed in the tomcat-9.0.36-8.4 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:21:40.917277Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"openSUSE-SU-2024:13441-1","title":"tomcat10-10.1.14-1.1 on GA media","description":"These are all security issues fixed in the tomcat10-10.1.14-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:52:52.718146Z","updated_at":"2026-11-02T16:58:36.327643Z"},{"id":"ROOT-APP-MAVEN-CVE-2021-25122","title":"CVE-2021-25122 in io.root.org.apache.tomcat.embed:tomcat-embed-core - Patched by Root","description":"Root has patched CVE-2021-25122 in the io.root.org.apache.tomcat.embed:tomcat-embed-core package for Root:Maven. Multiple fixed versions available.","status":"published","published":"2026-07-09T10:48:23Z","modified":"2026-07-09T14:00:33.38006589Z","updated_at":"2026-11-02T15:53:27.066589Z"},{"id":"SUSE-SU-2021:0988-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\n- CVE-2021-25122: Apache Tomcat h2c request mix-up (bsc#1182912)\n- CVE-2021-25329: Complete fix for CVE-2020-9484 (bsc#1182909)\n","status":"published","published":"2021-03-30T15:58:09Z","modified":"2025-05-02T04:31:13.576449Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2021:0989-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\n- Fixed CVEs:\n  * CVE-2021-25122: Apache Tomcat h2c request mix-up (bsc#1182912)\n  * CVE-2021-25329: Complete fix for CVE-2020-9484 (bsc#1182909)\n- Log if file access is blocked due to symlinks: CVE-2021-24122 (bsc#1180947)\n","status":"published","published":"2021-03-30T15:58:52Z","modified":"2025-05-02T04:31:13.393049Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2021:1008-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\nCVE-2021-25122: Apache Tomcat h2c request mix-up (bsc#1182912)\nCVE-2021-25329: Complete fix for CVE-2020-9484 (bsc#1182909)\n","status":"published","published":"2021-04-01T15:49:15Z","modified":"2026-02-04T04:14:36.01809Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2021:1009-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\n- CVE-2021-24122: Fixed an information disclosure if resources are served from the NTFS file system (bsc#1180947).\n- CVE-2021-25122: Apache Tomcat h2c request mix-up (bsc#1182912)\n- CVE-2021-25329: Complete fix for CVE-2020-9484 (bsc#1182909)\n","status":"published","published":"2021-04-01T15:50:14Z","modified":"2026-02-04T03:07:39.604531Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2026:1058-1","title":"Security update for tomcat","description":"This update for tomcat fixes the following issues:\n\nUpdate to Tomcat 9.0.115:\n\n- CVE-2025-48989: HTTP/2 protocol (including DNS over HTTPS) is vulnerable to 'MadeYouReset' DoS attack (bsc#1243895).\n- CVE-2025-52434: race condition on connection close when using the APR/Native connector could lead to a JVM crash\n  (bsc#1246389).\n- CVE-2025-53506: uncontrolled resource HTTP/2 client consumption vulnerability (bsc#1246318).\n- CVE-2025-66614: client certificate verification bypass due to virtual host mapping (bsc#1258371).\n- CVE-2026-24733: improper input validation on HTTP/0.9 requests (bsc#1258385).\n- CVE-2023-44487: Rapid reset attack (bsc#1216182).\n","status":"published","published":"2026-03-26T09:46:45Z","modified":"2026-03-27T08:48:24.814862Z","updated_at":"2026-11-02T15:54:01.262144Z"},{"id":"USN-5360-1","title":"tomcat9 vulnerabilities","description":"It was discovered that Tomcat incorrectly performed input verification.\nA remote attacker could possibly use this issue to intercept sensitive\ninformation. (CVE-2020-13943, CVE-2020-17527, CVE-2021-25122, CVE-2021-30640)\n\nIt was discovered that Tomcat did not properly deserialize untrusted data.\nAn attacker could possibly use this issue to execute arbitrary code.\n(CVE-2020-9484, CVE-2021-33037)\n\nIt was discovered that Tomcat did not properly validate the input length. An\nattacker could possibly use this to trigger an infinite loop, resulting in a\ndenial of service. (CVE-2021-25329, CVE-2021-41079)\n","status":"published","published":"2022-03-31T18:51:57Z","modified":"2026-04-27T16:19:03.780060309Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-6943-1","title":"tomcat8, tomcat9 vulnerabilities","description":"It was discovered that Tomcat incorrectly handled certain uncommon\nPersistenceManager with FileStore configurations. A remote attacker could\npossibly use this issue to execute arbitrary code. This issue only affected\ntomcat8 for Ubuntu 18.04 LTS (CVE-2020-9484)\n\nIt was discovered that Tomcat incorrectly handled certain HTTP/2 connection\nrequests. A remote attacker could use this issue to obtain wrong responses\npossibly containing sensitive information. This issue only affected tomcat8\nfor Ubuntu 18.04 LTS (CVE-2021-25122)\n\nThomas Wozenilek discovered that Tomcat incorrectly handled certain TLS\npackets. A remote attacker could possibly use this issue to cause a denial\nof service. This issue only affected tomcat8 for Ubuntu 18.04 LTS\n(CVE-2021-41079)\n\nTrung Pham discovered that a race condition existed in Tomcat when handling\nsession files with FileStore. A remote attacker could possibly use this\nissue to execute arbitrary code. This issue affected tomcat8 for Ubuntu\n16.04 LTS and Ubuntu 18.04 LTS, and tomcat9 for Ubuntu 18.04 LTS and Ubuntu\n20.04 LTS (CVE-2022-23181)\n\nIt was discovered that Tomcat's documentation incorrectly stated that\nEncryptInterceptor provided availability protection when running over an\nuntrusted network. A remote attacker could possibly use this issue to cause\na denial of service even if EncryptInterceptor was being used. This issue\naffected tomcat8 for Ubuntu 18.04 LTS, and tomcat9 for Ubuntu 18.04 LTS,\nUbuntu 20.04 LTS and Ubuntu 22.04 LTS (CVE-2022-29885)\n","status":"published","published":"2024-08-01T20:25:09Z","modified":"2026-06-25T13:32:28.896823535Z","updated_at":"2026-11-02T16:58:17.914523Z"}]}}