{"id":"USN-6881-1","summary":"exim4 vulnerability","details":"It was discovered that Exim did not enforce STARTTLS sync point on client\nside. An attacker could possibly use this issue to perform response\ninjection during MTA SMTP sending.\n","modified":"2026-04-22T11:20:51.538788Z","published":"2024-07-08T09:37:45Z","related":["UBUNTU-CVE-2021-38371"],"upstream":["CVE-2021-38371","UBUNTU-CVE-2021-38371"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6881-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-38371"}],"affected":[{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.82-3ubuntu2.4+esm8?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.82-3ubuntu2.4+esm8"}]}],"versions":["4.80-7ubuntu3","4.80-7ubuntu4","4.80-9ubuntu1","4.80-9ubuntu2","4.82-3ubuntu1","4.82-3ubuntu2","4.82-3ubuntu2.1","4.82-3ubuntu2.2","4.82-3ubuntu2.3","4.82-3ubuntu2.4","4.82-3ubuntu2.4+esm1","4.82-3ubuntu2.4+esm2","4.82-3ubuntu2.4+esm3","4.82-3ubuntu2.4+esm4","4.82-3ubuntu2.4+esm6","4.82-3ubuntu2.4+esm7"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"exim4","binary_version":"4.82-3ubuntu2.4+esm8"},{"binary_name":"exim4-base","binary_version":"4.82-3ubuntu2.4+esm8"},{"binary_name":"exim4-config","binary_version":"4.82-3ubuntu2.4+esm8"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.82-3ubuntu2.4+esm8"},{"binary_name":"exim4-daemon-light","binary_version":"4.82-3ubuntu2.4+esm8"},{"binary_name":"eximon4","binary_version":"4.82-3ubuntu2.4+esm8"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-38371","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6881-1.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.86.2-2ubuntu2.6+esm7?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.86.2-2ubuntu2.6+esm7"}]}],"versions":["4.86-3ubuntu1","4.86-7ubuntu1","4.86-7ubuntu2","4.86-7ubuntu3","4.86.2-2ubuntu1","4.86.2-2ubuntu2","4.86.2-2ubuntu2.1","4.86.2-2ubuntu2.2","4.86.2-2ubuntu2.3","4.86.2-2ubuntu2.4","4.86.2-2ubuntu2.5","4.86.2-2ubuntu2.6","4.86.2-2ubuntu2.6+esm1","4.86.2-2ubuntu2.6+esm2","4.86.2-2ubuntu2.6+esm4","4.86.2-2ubuntu2.6+esm5","4.86.2-2ubuntu2.6+esm6"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"exim4","binary_version":"4.86.2-2ubuntu2.6+esm7"},{"binary_name":"exim4-base","binary_version":"4.86.2-2ubuntu2.6+esm7"},{"binary_name":"exim4-config","binary_version":"4.86.2-2ubuntu2.6+esm7"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.86.2-2ubuntu2.6+esm7"},{"binary_name":"exim4-daemon-light","binary_version":"4.86.2-2ubuntu2.6+esm7"},{"binary_name":"eximon4","binary_version":"4.86.2-2ubuntu2.6+esm7"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-38371","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6881-1.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.90.1-1ubuntu1.10+esm4?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.90.1-1ubuntu1.10+esm4"}]}],"versions":["4.89-5ubuntu1","4.89-9ubuntu1","4.89-9ubuntu2","4.89-9ubuntu3","4.89-9ubuntu4","4.90.1-1ubuntu1","4.90.1-1ubuntu1.1","4.90.1-1ubuntu1.2","4.90.1-1ubuntu1.3","4.90.1-1ubuntu1.4","4.90.1-1ubuntu1.5","4.90.1-1ubuntu1.8","4.90.1-1ubuntu1.9","4.90.1-1ubuntu1.10","4.90.1-1ubuntu1.10+esm1","4.90.1-1ubuntu1.10+esm2","4.90.1-1ubuntu1.10+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"exim4","binary_version":"4.90.1-1ubuntu1.10+esm4"},{"binary_name":"exim4-base","binary_version":"4.90.1-1ubuntu1.10+esm4"},{"binary_name":"exim4-config","binary_version":"4.90.1-1ubuntu1.10+esm4"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.90.1-1ubuntu1.10+esm4"},{"binary_name":"exim4-daemon-light","binary_version":"4.90.1-1ubuntu1.10+esm4"},{"binary_name":"eximon4","binary_version":"4.90.1-1ubuntu1.10+esm4"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-38371","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6881-1.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.93-13ubuntu1.11?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.93-13ubuntu1.11"}]}],"versions":["4.92.1-1ubuntu3","4.92.1-1ubuntu4","4.93~RC2-1ubuntu1","4.93-9ubuntu1","4.93-11ubuntu1","4.93-12ubuntu1","4.93-13ubuntu1","4.93-13ubuntu1.1","4.93-13ubuntu1.5","4.93-13ubuntu1.6","4.93-13ubuntu1.7","4.93-13ubuntu1.8","4.93-13ubuntu1.9","4.93-13ubuntu1.10"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"exim4","binary_version":"4.93-13ubuntu1.11"},{"binary_name":"exim4-base","binary_version":"4.93-13ubuntu1.11"},{"binary_name":"exim4-config","binary_version":"4.93-13ubuntu1.11"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.93-13ubuntu1.11"},{"binary_name":"exim4-daemon-light","binary_version":"4.93-13ubuntu1.11"},{"binary_name":"eximon4","binary_version":"4.93-13ubuntu1.11"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2021-38371","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6881-1.json"}}],"schema_version":"1.7.5"}