CVE-2020-14066
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 · uneditedIceWarp Email Server 12.3.0.1 allows remote attackers to upload JavaScript files that are dangerous for clients to access.
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 confidenceIceWarp Email Server 12.3.0.1 contains an unrestricted file upload vulnerability that allows remote, unauthenticated attackers to upload arbitrary JavaScript files to the server. These malicious files can then be served to clients, enabling cross-site scripting (XSS) attacks or other client-side code execution when users access the uploaded files.
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= 12.3.0.1CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
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Confirm IceWarp Mail Server versionLocate the IceWarp installation directory and check the version. Common paths: C:\Program Files\IceWarp\ or /opt/icewarp/. Look for a version file, or check the web admin interface at /admin/ for the server version displayed in the system information or about section.Affected if The installed version is exactly 12.3.0.1 (this is the only affected version per the CVE)
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Verify webmail interface is accessibleAttempt to access the IceWarp webmail login page. Common URLs: https://yourserver:32001/webmail/ or https://yourserver/webmail/. Determine if port 32001 or standard HTTPS ports are open and responding.Affected if The webmail interface is publicly or internally accessible, as the vulnerability allows unauthenticated file uploads
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Check if file upload functionality is enabledLog into the webmail interface and attempt to access the file attachment/upload feature in compose emails or the file manager module. Verify the upload functionality responds without errors.Affected if File upload features are enabled and functional in the webmail interface
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Inspect upload directories for suspicious filesLocate the webmail upload directory. Common paths: C:\Program Files\IceWarp\webmail\同期\ or /opt/icewarp/webmail/files/. Search for .js, .html, .htm files that were not intentionally uploaded by administrators.Affected if Any .js or other script files exist in upload directories that were not explicitly placed there by administrators
You are affected if IceWarp Mail Server version 12.3.0.1 is installed AND the webmail file upload feature is accessible and enabled, regardless of whether suspicious files are currently present.
Generated from the published advisory. Verify against your own configuration.
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 dataImplement strict server-side file type validation to reject executable and script file types (particularly .js, .html, .htm, .asp, .php) during upload. Additionally, serve uploaded files from a non-executable directory or with proper Content-Type headers that prevent script execution in browsers.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-14066 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-14066 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
- No spam, self-promotion, credentials, or personal data