CVE-2025-59028 MEDIUM

CVE-2025-59028

Vendor Open-Xchange Gmbh
Product OX Dovecot Pro
Weakness CWE-20 · Input validation
Published March 27, 2026
Last update March 27, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
March 27, 2026 Record updated