Medium severity · published May 16, 2025
CVE-2025-40631
HTTP host header injection vulnerability in IceWarp Mail Server
6.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IM
Icewarp Mail Server · Icewarp
11.4.0 · source: vendor
MS
Mail Server · Icewarp
11.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40631
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-40631
Third Party Advisory
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-icewarp-mail-server
More from Icewarp Mail Server
6.1
CVE-2025-40632
Cross-site scripting (XSS) vulnerability in IceWarp Mail Server
6.1
CVE-2025-40630
Open redirection vulnerability in IceWarp Mail Server