Description

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.

INFO

Published Date :

2026-03-27T08:10:15.246Z

Last Modified :

2026-03-27T19:43:08.685Z

Source :

OX
AFFECTED PRODUCTS

The following products are affected by CVE-2025-59028 vulnerability.

Vendors Products
Dovecot
  • Dovecot
Open-xchange
  • Dovecot
  • Ox Dovecot Pro
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-59028.

URL Resource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-59028 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-59028 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
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Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact