{"id":"UBUNTU-CVE-2020-11653","details":"An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an assertion failure and daemon restart, which causes a performance loss.","modified":"2026-04-22T13:59:30.727173Z","published":"2020-04-08T23:15:00Z","related":["USN-5474-1","USN-5474-2"],"upstream":["CVE-2020-11653"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-11653"},{"type":"REPORT","url":"https://varnish-cache.org/security/VSV00005.html#vsv00005"},{"type":"REPORT","url":"https://github.com/varnishcache/varnish-cache/commit/2d8fc1a784a1e26d78c30174923a2b14ee2ebf62"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5474-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-11653"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5474-2"}],"affected":[{"package":{"name":"varnish","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/varnish@6.2.1-2ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.2.1-2ubuntu0.1"}]}],"versions":["6.1.1-1","6.2.1-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libvarnishapi2","binary_version":"6.2.1-2ubuntu0.1"},{"binary_name":"varnish","binary_version":"6.2.1-2ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11653.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}