{"id":"UBUNTU-CVE-2021-28652","details":"An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.","modified":"2026-01-30T01:19:58.134919Z","published":"2021-05-27T12:15:00Z","related":["USN-4981-1"],"upstream":["CVE-2021-28652"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28652"},{"type":"REPORT","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-m47m-9hvw-7447"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4981-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-28652"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm6?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17","3.5.12-1ubuntu6","3.5.12-1ubuntu7","3.5.12-1ubuntu7.1","3.5.12-1ubuntu7.2","3.5.12-1ubuntu7.3","3.5.12-1ubuntu7.4","3.5.12-1ubuntu7.5","3.5.12-1ubuntu7.6","3.5.12-1ubuntu7.7","3.5.12-1ubuntu7.8","3.5.12-1ubuntu7.9","3.5.12-1ubuntu7.10","3.5.12-1ubuntu7.11","3.5.12-1ubuntu7.12","3.5.12-1ubuntu7.13","3.5.12-1ubuntu7.14","3.5.12-1ubuntu7.15","3.5.12-1ubuntu7.16","3.5.12-1ubuntu7.16+esm1","3.5.12-1ubuntu7.16+esm2","3.5.12-1ubuntu7.16+esm3","3.5.12-1ubuntu7.16+esm4","3.5.12-1ubuntu7.16+esm5","3.5.12-1ubuntu7.16+esm6"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-cgi","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-common","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-purge","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid3","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squidclient","binary_version":"3.5.12-1ubuntu7.16+esm6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28652.json"}},{"package":{"name":"squid3","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.11?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.27-1ubuntu1.11"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"squid","binary_version":"3.5.27-1ubuntu1.11"},{"binary_name":"squid-cgi","binary_version":"3.5.27-1ubuntu1.11"},{"binary_name":"squid-common","binary_version":"3.5.27-1ubuntu1.11"},{"binary_name":"squid-purge","binary_version":"3.5.27-1ubuntu1.11"},{"binary_name":"squid3","binary_version":"3.5.27-1ubuntu1.11"},{"binary_name":"squidclient","binary_version":"3.5.27-1ubuntu1.11"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28652.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/squid@4.10-1ubuntu1.4?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10-1ubuntu1.4"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"squid","binary_version":"4.10-1ubuntu1.4"},{"binary_name":"squid-cgi","binary_version":"4.10-1ubuntu1.4"},{"binary_name":"squid-common","binary_version":"4.10-1ubuntu1.4"},{"binary_name":"squid-purge","binary_version":"4.10-1ubuntu1.4"},{"binary_name":"squidclient","binary_version":"4.10-1ubuntu1.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28652.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}