{"id":"UBUNTU-CVE-2020-15953","details":"LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a \"begin TLS\" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka \"response injection.\"","modified":"2026-05-20T16:04:13.321887969Z","published":"2020-07-27T07:15:00Z","related":["USN-4598-1"],"upstream":["CVE-2020-15953"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-15953"},{"type":"REPORT","url":"https://security.gentoo.org/glsa/202007-55"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4598-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-15953"}],"affected":[{"package":{"name":"libetpan","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6-1ubuntu0.1"}]}],"versions":["1.5-2","1.6-1","1.6-1build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libetpan17","binary_version":"1.6-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.0-1","1.8.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20","binary_version":"1.8.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.3-2","1.9.4-2","1.9.4-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20","binary_version":"1.9.4-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.4-3","1.9.4-3+deb11u1build0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20","binary_version":"1.9.4-3+deb11u1build0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.4-3.1","1.9.4-3.2","1.9.4-3.2build1","1.9.4-3.2build2"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20t64","binary_version":"1.9.4-3.2build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.4-5","1.9.4-6"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20t64","binary_version":"1.9.4-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}},{"package":{"name":"libetpan","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libetpan?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.4-6","1.9.4-7","1.9.4-8"],"ecosystem_specific":{"binaries":[{"binary_name":"libetpan20t64","binary_version":"1.9.4-8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15953.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}