{"id":"DEBIAN-CVE-2025-59028","details":"When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.","modified":"2026-08-27T23:05:49.861564149Z","published":"2026-03-27T09:16:18.620Z","upstream":["CVE-2025-59028"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-59028"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Debian:13","purl":"pkg:deb/debian/dovecot?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.4.1+dfsg1-6+deb13u4"}]}],"versions":["1:2.4.1+dfsg1-6","1:2.4.1+dfsg1-6+deb13u1","1:2.4.1+dfsg1-6+deb13u2","1:2.4.1+dfsg1-6+deb13u3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-59028.json"}},{"package":{"name":"dovecot","ecosystem":"Debian:14","purl":"pkg:deb/debian/dovecot?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.4.3+dfsg1-1"}]}],"versions":["1:2.4.1+dfsg1-6","1:2.4.1+dfsg1-7","1:2.4.1+dfsg1-8","1:2.4.1+dfsg1-9","1:2.4.2+dfsg1-1","1:2.4.2+dfsg1-2","1:2.4.2+dfsg1-3","1:2.4.2+dfsg1-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-59028.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}