{"id":"USN-5104-1","summary":"squid, squid3 vulnerability","details":"Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote\nattacker could use this issue to cause Squid to crash, resulting in a\ndenial of service, or possibly obtain sensitive information.\n","modified":"2026-04-27T15:57:30.866782Z","published":"2021-10-05T14:05:18Z","related":["UBUNTU-CVE-2021-28116"],"upstream":["CVE-2021-28116","UBUNTU-CVE-2021-28116"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5104-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28116"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.12?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.27-1ubuntu1.12"}]}],"versions":["3.5.23-5ubuntu1","3.5.23-5ubuntu2","3.5.27-1ubuntu1","3.5.27-1ubuntu1.1","3.5.27-1ubuntu1.2","3.5.27-1ubuntu1.3","3.5.27-1ubuntu1.4","3.5.27-1ubuntu1.5","3.5.27-1ubuntu1.6","3.5.27-1ubuntu1.7","3.5.27-1ubuntu1.8","3.5.27-1ubuntu1.9","3.5.27-1ubuntu1.10","3.5.27-1ubuntu1.11"],"ecosystem_specific":{"binaries":[{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squid"},{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squid-cgi"},{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squid-common"},{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squid-purge"},{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squid3"},{"binary_version":"3.5.27-1ubuntu1.12","binary_name":"squidclient"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5104-1.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"id":"CVE-2021-28116","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]}}},{"package":{"name":"squid","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/squid@4.10-1ubuntu1.5?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10-1ubuntu1.5"}]}],"versions":["4.8-1ubuntu2","4.8-1ubuntu3","4.9-2ubuntu1","4.9-2ubuntu2","4.9-2ubuntu3","4.9-2ubuntu4","4.10-1ubuntu1","4.10-1ubuntu1.1","4.10-1ubuntu1.2","4.10-1ubuntu1.3","4.10-1ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_version":"4.10-1ubuntu1.5","binary_name":"squid"},{"binary_version":"4.10-1ubuntu1.5","binary_name":"squid-cgi"},{"binary_version":"4.10-1ubuntu1.5","binary_name":"squid-common"},{"binary_version":"4.10-1ubuntu1.5","binary_name":"squid-purge"},{"binary_version":"4.10-1ubuntu1.5","binary_name":"squidclient"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5104-1.json","cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2021-28116","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]}}}],"schema_version":"1.7.5"}