Vulnerability in Icewarp Mail Server
CVE-2025-40631
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 li…
EPSS: 0.002 (8.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Icewarp Mail Server — versions 11.4.0
- Icewarp Mail_server — versions 11.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@incibe.es (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-40631?
- CVE-2025-40631 is a medium-severity vulnerability in Icewarp Mail Server, classified under Improper Neutralization of HTTP Headers for Scripting Syntax. CVSS score: 6.1/10. Published 2025-05-16.
- How severe is CVE-2025-40631?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2025-40631 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.