CVE-2017-18433
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 · uneditedcPanel before 64.0.21 allows code execution by webmail and demo accounts via a store_filter API call (SEC-236).
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 · high confidencecPanel before version 64.0.21 contains a privilege escalation vulnerability where webmail and demo accounts can achieve arbitrary code execution through the store_filter API call (SEC-236). This allows low-privilege users to escape their sandbox and execute commands with elevated privileges.
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>= 55.9999.61, < 56.0.49>= 57.9999.48, < 58.0.49>= 59.9999.58, < 60.0.43>= 61.9999.55, < 62.0.24>= 63.9999.74, < 64.0.21CVSS 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:3.0/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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Check installed cPanel versionRun: /usr/local/cpanel/cpanel -V or grep version from /usr/local/cpanel/versionAffected if Version is between 55.9999.61 and 56.0.48, OR 57.9999.48 and 58.0.48, OR 59.9999.58 and 60.0.42, OR 61.9999.55 and 62.0.23, OR 63.9999.74 and 64.0.20
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Determine if webmail accounts existCheck for user accounts with webmail privileges via WHM API or by examining /var/cpanel/users/ directory for accounts with webmail access enabledAffected if Webmail accounts are present and the cPanel version is in the affected range
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Determine if demo accounts existCheck for demo accounts in /var/cpanel/users/ or via WHM API listaccoounts for accounts with demo feature enabledAffected if Demo accounts are present and the cPanel version is in the affected range
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Verify store_filter API is accessible to low-privilege usersExamine cPanel API documentation or logs for store_filter calls originating from webmail or demo user sessions - check /usr/local/cpanel/logs/error_log or API access logsAffected if store_filter API calls can be made by webmail or demo users and the cPanel version is affected
You are affected if your cPanel version falls within any of the five affected ranges AND you have webmail or demo accounts enabled that can access the store_filter API call.
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 data56.0.4958.0.4960.0.43
Upgrade cPanel to version 64.0.21 or later. If immediate patching is not feasible, temporarily disable or restrict webmail and demo account functionality as a compensating control.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-18433 — 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-2017-18433 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