{"id":"AZL-81686","summary":"CVE-2025-59028 affecting package dovecot 2.3.20-1","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":"2026-09-02T05:29:58Z","published":"2026-03-27T09:16:18Z","upstream":["CVE-2025-59028"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-59028"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/dovecot"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.3.20-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81686.json"}}],"schema_version":"1.9.0"}