{"id":"CVE-2020-17509","aliases":["DEBIAN-CVE-2020-17509","DSA-4805-1","EUVD-2020-9457","GHSA-wgc8-c98w-8fvh","UBUNTU-CVE-2020-17509"],"status":"published","title":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option...","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","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":0.01814,"percentile":0.78952,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2020-12-07T00:00:00Z","modified":"2026-10-26T12:02:28Z","fixes":[{"ecosystem":"Debian:12","package":"trafficserver","fixed_in":["8.1.1+ds-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.1.1+ds-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"trafficserver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2+ds-1+deb10u4"}]}],"versions":["8.0.2+ds-1","8.0.2+ds-1+deb10u1","8.0.2+ds-1+deb10u2","8.0.2+ds-1+deb10u3"],"bundled":2},{"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"}],"references":[{"url":"https://lists.apache.org/thread.html/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cannounce.trafficserver.apache.org%3E","tags":["x_refsource_MISC","x_transferred","Mailing List","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17509"},{"url":"https://github.com/advisories/GHSA-wgc8-c98w-8fvh"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-17509","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-17509","tags":["report"]},{"url":"https://github.com/apache/trafficserver/pull/7359","tags":["report"]},{"url":"https://lists.apache.org/thread.html/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cdev.trafficserver.apache.org%3E","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-17509","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-17509","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T09:40:20Z","modified":"2024-08-04T14:00:48.143Z","updated_at":"2026-11-02T14:35:54.80237Z"}],"euvd":[{"id":"EUVD-2020-9457","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T09:40:20Z","modified":"2024-08-04T14:00:48Z","updated_at":"2026-11-03T03:07:26.951665Z"}],"ghsa":[{"id":"GHSA-wgc8-c98w-8fvh","title":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option...","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2022-05-24T17:38:29Z","modified":"2023-01-29T05:05:18Z","cwes":["CWE-444"],"updated_at":"2026-11-02T14:45:45.932105Z"}],"nvd":[{"id":"CVE-2020-17509","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T10:15:13.407Z","modified":"2026-06-17T02:59:02.573Z","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":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:06:28.892872Z"}],"osv":[{"id":"CVE-2020-17509","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T10:15:13.407Z","modified":"2026-10-24T10:30:44.367486506Z","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":"2026-11-02T15:44:15.212689Z"},{"id":"DEBIAN-CVE-2020-17509","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T10:15:13.407Z","modified":"2026-10-26T12:02:28.694869783Z","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":"2026-11-02T15:45:33.384087Z"},{"id":"UBUNTU-CVE-2020-17509","description":"ATS negative cache option is vulnerable to a cache poisoning attack. If you have this option enabled, please upgrade or disable this feature. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.","status":"published","published":"2021-01-11T10:15:00Z","modified":"2026-04-22T12:32:00.761524Z","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":"2026-11-02T15:54:23.344108Z"},{"id":"DSA-4805-1","title":"trafficserver - security update","status":"published","published":"2020-12-07T00:00:00Z","modified":"2026-03-09T02:11:09.611724Z","updated_at":"2026-11-02T15:46:17.19998Z"}]}}