Home/CVE/HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. By modifying the Host header a
CVE

CVE-2025-40631

HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0. By modifying the Host header a

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.

MEDIUM · CVSS 6.1 EPSS 0.00195
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax
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Affected Products & Versions

1
icewarp mail serverall versions
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · cve-coordination@incibe.es
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 May 2025 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-icewarp-mail-serverThird Party Advisory
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