{"id":"UBUNTU-CVE-2020-35680","details":"smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.","modified":"2026-05-20T16:04:28.350048114Z","published":"2020-12-24T16:15:00Z","upstream":["CVE-2020-35680"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-35680"},{"type":"REPORT","url":"https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1"},{"type":"REPORT","url":"https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html"},{"type":"REPORT","url":"https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-35680"}],"affected":[{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.3p1-4","5.4.1p1-1","5.4.1p1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.4.1p1-1ubuntu0.1~esm1","binary_name":"opensmtpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.json"}},{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.3p1-6","6.0.3p1-6build1","6.6.1p1-1","6.6.1p1-3","6.6.1p1-4","6.6.1p1-5","6.6.2p1-1","6.6.4p1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.6.4p1-1","binary_name":"opensmtpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.json"}},{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.8.0p2-3","6.8.0p2-4","6.8.0p2-4build1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.8.0p2-4build1","binary_name":"opensmtpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.json"}},{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.3.0p1-1","7.3.0p2-1","7.4.0p1-1","7.4.0p1-1build2","7.4.0p1-1build4"],"ecosystem_specific":{"binaries":[{"binary_name":"opensmtpd","binary_version":"7.4.0p1-1build4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.json"}},{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.5.0p0-1","7.7.0p0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"opensmtpd","binary_version":"7.7.0p0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.json"}},{"package":{"name":"opensmtpd","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/opensmtpd?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.7.0p0-1","7.8.0p0-1","7.8.0p0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"opensmtpd","binary_version":"7.8.0p0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-35680.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:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}