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Mail ServerApplication · Icewarp

CVE-2025-40630

MEDIUM · 6.1 CVSS v3.1 Published 2025-05-16
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Open redirection vulnerability in IceWarp Mail Server affecting version 11.4.0. This vulnerability allows an attacker to redirect a user to any domain by sending a malicious URL to the victim, for example “ https://icewarp.domain.com//<MALICIOUS_DOMAIN>/%2e%2e” https://icewarp.domain.com///%2e%2e” . This vulnerability has been tested in Firefox.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Open redirection vulnerability in IceWarp Mail Server version 11.4.0 allows attackers to redirect users to arbitrary domains via crafted URLs using path traversal techniques with double slashes and encoded dot sequences (%2e%2e). The vulnerability can be exploited by sending victims malicious links like 'https://icewarp.domain.com//<MALICIOUS_DOMAIN>/%2e%2e'.

MitigationApply vendor patch when available; implement strict URL validation and allowlist-based redirect logic to prevent arbitrary domain redirects.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Mail ServerApplication
Affected:= 11.4.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify IceWarp Mail Server installation and version
    Locate the IceWarp installation directory and check the version. On Windows, look in the installation folder for a version file or check the product information. On Linux, run: dpkg -l | grep icewarp or rpm -qa | grep icewarp. Also check the web admin interface login page for version disclosure.
    Affected if The installed version is exactly 11.4.0
  2. Confirm web service is accessible
    Verify the IceWarp web client or admin interface is reachable. Try accessing the base URL of the IceWarp server (e.g., https://yourdomain.com or the webmail endpoint). The vulnerability affects the web-based URL handling.
    Affected if The web interface is accessible and the server is running
  3. Review web server access logs for exploitation attempts
    Examine the web server logs (typically found in IceWarp's log directory or the web server's access log) for entries containing double slashes (//) followed by a domain and %2e%2e patterns. Search for: grep -E "//.*%2e%2e" <logfile> or manually inspect for URLs matching the pattern /\/<external-domain>\/\.\.
    Affected if Suspicious URL patterns matching the exploitation signature are found in logs
  4. Check current redirect/URL validation configuration
    Review IceWarp's web server configuration files for any redirect or URL forwarding rules. Look in the IceWarp config directory for settings related to URL redirects, forwarding, or path handling. Check if allowlist-based validation is configured.
    Affected if No strict URL allowlist validation is configured, or arbitrary domain redirects are permitted

You are affected if IceWarp Mail Server version 11.4.0 is installed and running with its web interface accessible, especially if logs show suspicious URL patterns or no strict URL validation is configured.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor patch when available; implement strict URL validation and allowlist-based redirect logic to prevent arbitrary domain redirects.

Fix this in Mail Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-40630 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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