Which versions of Mail Server are affected by CVE-2025-40631?

CVE-2025-40631 is a low-severity vulnerability in Icewarp Mail Server affecting (CVSS 2.0).

How to fix or mitigate CVE-2025-40631?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Mail Server CVE-2025-40631

Q: What is the CVSS score of CVE-2025-40631?

CVE-2025-40631 has a CVSS 4.0 base score of 2.0 (Low). CVSS vector: CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

LOW

Improper Neutralization of HTTP Headers for Scripting Syntax (CWE-644)

2025-05-16 cve-coordination@incibe.es

RCE Mail Server

2.0

CVSS 4.0

CVSS VectorNVD

CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:42 vuln.today

CVE Published

May 16, 2025 - 11:15 nvd

LOW 2.0

DescriptionNVD

HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. By modifying the Host header and adding a payload, arbitrary JavaScript code can be executed on page load. The user must interact with a malicious link to be redirected.

AnalysisAI

HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. Rated low severity (CVSS 2.0), this vulnerability is no authentication required. No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-644. HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. By modifying the Host header and adding a payload, arbitrary JavaScript code can be executed on page load. The user must interact with a malicious link to be redirected. Affected products include: Icewarp Mail Server. Version information: version 11.4.0..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

CVE-2025-40631 vulnerability details – vuln.today

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