CVE-2025-59028

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:dovecot:dovecot::::::::
	cpe:2.3:a:open-xchange:dovecot:::::pro:::*

History

30 Sep 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Al enviar datos SASL base64 inválidos, el proceso de inicio de sesión se desconecta del servidor de autenticación, lo que provoca que todas las sesiones de autenticación activas fallen. Los datos BASE64 inválidos pueden usarse para realizar un DoS a un servidor vulnerable para interrumpir los inicios de sesión concurrentes. Instale la versión corregida o deshabilite la concurrencia en los procesos de inicio de sesión (gran penalización de rendimiento en implementaciones grandes). No se conocen exploits disponibles públicamente.

Information

Published : 2026-03-27 09:16

Updated : 2026-10-07 09:10

NVD link : CVE-2025-59028

Mitre link : CVE-2025-59028

CVE.ORG link : CVE-2025-59028

JSON object : View

Products Affected

open-xchange

dovecot

dovecot

dovecot

CWE

CWE-20

Improper Input Validation

NVD-CWE-noinfo

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