CVE-2021-38589
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 · uneditedIn cPanel before 96.0.13, scripts/fix-cpanel-perl does not properly restrict the overwriting of files (SEC-588).
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 confidenceThe fix-cpanel-perl script in cPanel versions before 96.0.13 does not properly restrict file overwriting, allowing an attacker to potentially overwrite arbitrary files on the system. This improper input validation could enable privilege escalation or system compromise.
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< 11.96.0.13CVSS 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
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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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Identify installed cPanel versionRun the command 'whmapi1 version' or check /usr/local/cpanel/version to determine the currently installed cPanel versionAffected if The installed version is less than 11.96.0.13
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Locate the fix-cpanel-perl scriptSearch for the fix-cpanel-perl script on the system, typically found in /usr/local/cpanel/scripts/ or /scripts/ directoriesAffected if The script exists on the system and is executable by the attacker context
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Verify file overwrite restrictions in the scriptExamine the fix-cpanel-perl script source code for input validation on file paths, specifically looking for unrestricted file write operations or path traversal vulnerabilitiesAffected if The script lacks proper sanitization of file path arguments, allowing arbitrary file overwrites
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Check script permissions and ownershipRun 'ls -la /scripts/fix-cpanel-perl' or the equivalent path to verify who can execute the script and whether unprivileged users can trigger itAffected if The script is writable or executable by non-root users without proper controls
The environment is affected if the installed cPanel version is below 11.96.0.13 and the fix-cpanel-perl script exists with improper input validation allowing unrestricted file overwrites.
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.
dbcve · scoped11.96.0.13
Upgrade cPanel to version 96.0.13 or later to obtain the patched fix-cpanel-perl script with proper file overwrite restrictions.
cPanel 11.96.0.13 or later
- 1. Create a full backup of the cPanel server configuration and data before proceeding with any updates.
- 2. Access the server via SSH as root or use the cPanel WHM interface.
- 3. Run the cPanel update command: '/usr/local/cpanel/scripts/upcp' or use WHM >> cPanel >> Upgrade to the latest version.
- 4. Alternatively, force an upgrade to a specific version via WHM or command line to ensure version 11.96.0.13 or later is installed.
- 5. Verify the installed cPanel version by running: 'cat /usr/local/cpanel/version' or checking in WHM.
- 6. Confirm the fix-cpanel-perl script has been updated and the vulnerability is resolved.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-38589 — 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-2021-38589 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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- 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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