CVE-2025-40631

2.0 lowEPSS 0.2%

Low (2.0) in icewarp mail server. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

2.0 low

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

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
CWE: CWE-644
Published: 2025-05-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

icewarp:mail_server

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-icewarp-mail-server

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