CVE-2025-59028 in Open-Xchange OX Dovecot Proinfo

Summary

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.

Reservation

09/08/2025

Disclosure

03/27/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
353846	Open-Xchange OX Dovecot Pro improper authentication	287	Not defined	Official fix	CVE-2025-59028

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