{"id":"CVE-2021-37148","aliases":["DEBIAN-CVE-2021-37148","DSA-5153-1","EUVD-2021-23722","GHSA-p9mw-v4q4-qhvj","UBUNTU-CVE-2021-37148"],"status":"published","title":"Request Smuggling - transfer encoding validation","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.02695,"percentile":0.861,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2021-11-03T15:20:20Z","modified":"2026-10-24T10:30:31Z","fixes":[{"ecosystem":"Debian:12","package":"trafficserver","fixed_in":["9.1.1+ds-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.1+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"]}],"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-2021-37148"},{"url":"https://github.com/advisories/GHSA-p9mw-v4q4-qhvj"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-37148","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-37148","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/11/02/11","tags":["report"]},{"url":"https://github.com/apache/trafficserver/pull/8457/","tags":["report"]},{"url":"https://github.com/apache/trafficserver/commit/6e5070118a20772a30c3fccee2cf1c44f0a21fc0","tags":["report"]},{"url":"https://github.com/apache/trafficserver/commit/e2c9ac217f24dc3e91ff2c9f52b52093e8fb32d5","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-37148","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-37148","title":"Request Smuggling - transfer encoding validation","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T15:20:20Z","modified":"2024-08-04T01:16:03.219Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:58.359368Z"}],"euvd":[{"id":"EUVD-2021-23722","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T15:20:20Z","modified":"2024-08-04T01:16:03Z","updated_at":"2026-11-03T03:24:28.314716Z"}],"ghsa":[{"id":"GHSA-p9mw-v4q4-qhvj","title":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an...","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2022-05-24T19:19:34Z","modified":"2023-01-30T05:03:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:46:50.963031Z"}],"nvd":[{"id":"CVE-2021-37148","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T16:15:08.043Z","modified":"2026-06-17T04:00:08.567Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"CVE-2021-37148","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T16:15:08.043Z","modified":"2026-10-24T10:30:31.887643404Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:20.434873Z"},{"id":"DEBIAN-CVE-2021-37148","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T16:15:08.043Z","modified":"2026-10-23T18:05:22.81440924Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:35.233346Z"},{"id":"UBUNTU-CVE-2021-37148","description":"Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.0.1.","status":"published","published":"2021-11-03T16:15:00Z","modified":"2026-04-22T12:56:27.522633Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:54:27.870979Z"},{"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"}]}}