Description
MDaemon Mail Server 23.5.2 validates SPF, DKIM, and DMARC using the email enclosed in angle brackets (<>) in the From: header of SMTP DATA. An attacker can craft a From: header with multiple invisible Unicode thin spaces to display a spoofed sender while passing validation, allowing email spoofing even when anti-spoofing protections are in place. NOTE: this is disputed by the Supplier because UI spoofing occurs in a client, not in a server such as MDaemon's product or any other server implementation. Also, if a client without its own spoofing protection must be used, the Header Screening feature in MDaemon's product can be employed to mitigate the client-side vulnerability.
Published: 2025-11-05
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 13 Nov 2025 14:00:00 +0000

Type Values Removed Values Added
Description MDaemon Mail Server 23.5.2 validates SPF, DKIM, and DMARC using the email enclosed in angle brackets (<>) in the From: header of SMTP DATA. An attacker can craft a From: header with multiple invisible Unicode thin spaces to display a spoofed sender while passing validation, allowing email spoofing even when anti-spoofing protections are in place. MDaemon Mail Server 23.5.2 validates SPF, DKIM, and DMARC using the email enclosed in angle brackets (<>) in the From: header of SMTP DATA. An attacker can craft a From: header with multiple invisible Unicode thin spaces to display a spoofed sender while passing validation, allowing email spoofing even when anti-spoofing protections are in place. NOTE: this is disputed by the Supplier because UI spoofing occurs in a client, not in a server such as MDaemon's product or any other server implementation. Also, if a client without its own spoofing protection must be used, the Header Screening feature in MDaemon's product can be employed to mitigate the client-side vulnerability.

Thu, 06 Nov 2025 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Mdaemon
Mdaemon email Server
Vendors & Products Mdaemon
Mdaemon email Server

Wed, 05 Nov 2025 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-116
CWE-20
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 05 Nov 2025 15:00:00 +0000

Type Values Removed Values Added
Description MDaemon Mail Server 23.5.2 validates SPF, DKIM, and DMARC using the email enclosed in angle brackets (<>) in the From: header of SMTP DATA. An attacker can craft a From: header with multiple invisible Unicode thin spaces to display a spoofed sender while passing validation, allowing email spoofing even when anti-spoofing protections are in place.
References

Subscriptions

Mdaemon Email Server
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-13T13:57:52.736Z

Reserved: 2025-09-26T00:00:00.000Z

Link: CVE-2025-61084

cve-icon Vulnrichment

Updated: 2025-11-05T15:11:11.097Z

cve-icon NVD

Status : Deferred

Published: 2025-11-05T15:15:39.997

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-61084

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-06T10:07:06Z

Weaknesses