{"id":"CVE-2021-38161","aliases":["DEBIAN-CVE-2021-38161","DSA-5153-1","EUVD-2021-24631","GHSA-wp25-8fm6-33wm","UBUNTU-CVE-2021-38161"],"status":"published","title":"Not validating origin TLS certificate","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0195,"percentile":0.80493,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2021-11-03T15:20:24Z","modified":"2026-10-24T10:30:37Z","fixes":[{"ecosystem":"Debian:12","package":"trafficserver","fixed_in":["9.1.0+ds-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.0+ds-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2+ds-1+deb10u6"}]}],"versions":["8.0.2+ds-1","8.0.2+ds-1+deb10u1","8.0.2+ds-1+deb10u2","8.0.2+ds-1+deb10u3","8.0.2+ds-1+deb10u4","8.0.2+ds-1+deb10u5"],"bundled":6},{"source":"osv","ecosystem":"Debian:11","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.1.1+ds-1.1+deb11u1"}]}],"versions":["8.1.1+ds-1.1"],"bundled":6},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-2ubuntu1","5.3.0-2ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.0-5","7.1.2+ds-2","7.1.2+ds-2build1","7.1.2+ds-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.0.5+ds-1","8.0.5+ds-2","8.0.5+ds-2build1","8.0.5+ds-2ubuntu1","8.0.5+ds-3","8.0.5+ds-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.1.1+ds-1.1","9.1.1+ds-2build1","9.1.1+ds-2ubuntu0.1~esm1","9.1.1+ds-2ubuntu0.1","9.1.1+ds-2ubuntu0.1+esm1"]}],"products":[{"vendor":"apache","product":"traffic_server"},{"vendor":"apache software foundation","product":"apache traffic server"},{"vendor":"debian","product":"debian_linux"}],"references":[{"url":"https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164","tags":["x_refsource_MISC","x_transferred","Mailing List","Patch","Vendor Advisory","fix"]},{"url":"https://www.debian.org/security/2022/dsa-5153","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38161"},{"url":"https://github.com/advisories/GHSA-wp25-8fm6-33wm"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-38161","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-38161","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/11/02/11","tags":["report"]},{"url":"https://github.com/apache/trafficserver/commit/feefc5e4abc5011dfad5dcfef3f22998faf6e2d4","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38161","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-38161","title":"Not validating origin TLS certificate","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T15:20:24Z","modified":"2024-08-04T01:37:15.519Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:33:07.697752Z"}],"euvd":[{"id":"EUVD-2021-24631","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T15:20:24Z","modified":"2024-08-04T01:37:15Z","updated_at":"2026-11-03T03:24:25.678078Z"}],"ghsa":[{"id":"GHSA-wp25-8fm6-33wm","title":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows...","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2022-05-24T19:19:34Z","modified":"2023-01-30T05:03:34Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:51.868413Z"}],"nvd":[{"id":"CVE-2021-38161","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T16:15:08.137Z","modified":"2026-06-17T04:01:36.623Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"CVE-2021-38161","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T16:15:08.137Z","modified":"2026-10-24T10:30:37.174629287Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"DEBIAN-CVE-2021-38161","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T16:15:08.137Z","modified":"2026-10-23T18:03:31.305449652Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-38161","description":"Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.","status":"published","published":"2021-11-03T16:15:00Z","modified":"2026-04-22T12:58:16.717474Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:28.526929Z"},{"id":"DSA-5153-1","title":"trafficserver - security update","status":"published","published":"2022-05-30T00:00:00Z","modified":"2026-03-09T02:08:42.579445Z","updated_at":"2026-11-02T15:46:17.543497Z"}]}}