CVE-2025-40631
CWE-644Published: May 16, 2025· Updated: Jun 17, 2026
Official Description
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.
Technical Analysis
CVE-2025-40631 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (1)
Quick Facts
Related CVEs (CWE-644)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-40631 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts