{"id":"UBUNTU-CVE-2021-20314","details":"Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to Denial of service and potentially code execution via malicious crafted SPF explanation messages.","modified":"2026-04-22T14:32:20.838572Z","published":"2021-08-11T00:00:00Z","related":["USN-6584-1"],"upstream":["CVE-2021-20314"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-20314"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6584-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-20314"}],"affected":[{"package":{"name":"libspf2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libspf2@1.2.10-6ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.10-6ubuntu0.1~esm1"}]}],"versions":["1.2.10-6","1.2.10-6build1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.2.10-6ubuntu0.1~esm1","binary_name":"libmail-spf-xs-perl"},{"binary_version":"1.2.10-6ubuntu0.1~esm1","binary_name":"libspf2-2"},{"binary_name":"spfquery","binary_version":"1.2.10-6ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20314.json"}},{"package":{"name":"libspf2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libspf2@1.2.10-7ubuntu0.18.04.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.10-7ubuntu0.18.04.1~esm1"}]}],"versions":["1.2.10-7build2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libmail-spf-xs-perl","binary_version":"1.2.10-7ubuntu0.18.04.1~esm1"},{"binary_version":"1.2.10-7ubuntu0.18.04.1~esm1","binary_name":"libspf2-2"},{"binary_name":"spfquery","binary_version":"1.2.10-7ubuntu0.18.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20314.json"}},{"package":{"name":"libspf2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libspf2@1.2.10-7+deb9u2build0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.10-7+deb9u2build0.20.04.1"}]}],"versions":["1.2.10-7build3","1.2.10-7build4"],"ecosystem_specific":{"binaries":[{"binary_name":"libmail-spf-xs-perl","binary_version":"1.2.10-7+deb9u2build0.20.04.1"},{"binary_name":"libspf2-2","binary_version":"1.2.10-7+deb9u2build0.20.04.1"},{"binary_name":"spfquery","binary_version":"1.2.10-7+deb9u2build0.20.04.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20314.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:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}