ByteOS Network

NVD Vulnerability Details :

CVE-2025-59028

Analyzed

Source-security@open-xchange.com

Published At-27 Mar, 2026 | 09:16

Updated At-30 Apr, 2026 | 17:50

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary	3.1	7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Type: Secondary

Version: 3.1

Base score: 5.3

Base severity: MEDIUM

Vector:

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

Type: Primary

Version: 3.1

Base score: 7.5

Base severity: HIGH

Vector:

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

CPE Matches

Dovecot

>>dovecot>>Versions before 2.4.3(exclusive)

cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*

Open-Xchange AG

>>dovecot>>Versions before 3.1.2(exclusive)

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

Weaknesses

CWE ID	Type	Source
CWE-20	Secondary	security@open-xchange.com
NVD-CWE-noinfo	Primary	nvd@nist.gov

CWE ID: CWE-20

Type: Secondary

Source: security@open-xchange.com

CWE ID: NVD-CWE-noinfo

Type: Primary

Source: nvd@nist.gov

References

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

Hyperlink: https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json

Source: security@open-xchange.com

Resource:

Vendor Advisory

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History