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 Apr 2026, 17:50

Type	Values Removed	Values Added
References	~~() https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json -~~	() https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json - Vendor Advisory
CPE		cpe:2.3:a:dovecot:dovecot:::::::: cpe:2.3:a:open-xchange:dovecot:::::pro:::*
First Time		Open-xchange Open-xchange dovecot Dovecot Dovecot dovecot
CWE		NVD-CWE-noinfo

27 Mar 2026, 09:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-27 09:16

Updated : 2026-04-30 17:50

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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