{"id":"UBUNTU-CVE-2015-5400","details":"Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.","modified":"2025-09-08T16:43:26Z","published":"2015-09-28T20:59:00Z","upstream":["CVE-2015-5400"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-5400"},{"type":"REPORT","url":"http://www.squid-cache.org/Advisories/SQUID-2015_2.txt"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2015/07/06/8"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-5400"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu6?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.12-1ubuntu6"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17"],"ecosystem_specific":{"binaries":[{"binary_version":"3.5.12-1ubuntu6","binary_name":"squid"},{"binary_version":"3.5.12-1ubuntu6","binary_name":"squid-cgi"},{"binary_version":"3.5.12-1ubuntu6","binary_name":"squid-common"},{"binary_version":"3.5.12-1ubuntu6","binary_name":"squid-purge"},{"binary_version":"3.5.12-1ubuntu6","binary_name":"squid3"},{"binary_version":"3.5.12-1ubuntu6","binary_name":"squidclient"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-5400.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"low"}]}