{"id":"UBUNTU-CVE-2020-17509","details":"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.","modified":"2025-10-24T04:48:38Z","published":"2021-01-11T10:15:00Z","upstream":["CVE-2020-17509"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-17509"},{"type":"REPORT","url":"https://github.com/apache/trafficserver/pull/7359"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/raa9f0589c26c4d146646425e51e2a33e1457492df9f7ea2019daa6d3%40%3Cdev.trafficserver.apache.org%3E"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-17509"}],"affected":[{"package":{"name":"trafficserver","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/trafficserver@5.3.0-2ubuntu2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-2ubuntu1","5.3.0-2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"trafficserver","binary_version":"5.3.0-2ubuntu2"},{"binary_name":"trafficserver-dev","binary_version":"5.3.0-2ubuntu2"},{"binary_name":"trafficserver-experimental-plugins","binary_version":"5.3.0-2ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-17509.json"}},{"package":{"name":"trafficserver","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/trafficserver@7.1.2+ds-3?arch=source&distro=bionic"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"trafficserver","binary_version":"7.1.2+ds-3"},{"binary_name":"trafficserver-dev","binary_version":"7.1.2+ds-3"},{"binary_name":"trafficserver-experimental-plugins","binary_version":"7.1.2+ds-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-17509.json"}},{"package":{"name":"trafficserver","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/trafficserver@8.0.5+ds-3ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"trafficserver","binary_version":"8.0.5+ds-3ubuntu0.1~esm1"},{"binary_name":"trafficserver-dev","binary_version":"8.0.5+ds-3ubuntu0.1~esm1"},{"binary_name":"trafficserver-experimental-plugins","binary_version":"8.0.5+ds-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-17509.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}