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CpanelApplication

CVE-2017-18434

HIGH · 7.8 CVSS v3.0 Published 2019-08-02
Fix available
A fix is available. Upgrade to 56.0.49 / 58.0.49 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

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
cPanel before 64.0.21 allows code execution in the context of the root account via a SET_VHOST_LANG_PACKAGE multilang adminbin call (SEC-237).

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 confidence

A code execution vulnerability in cPanel's multilang adminbin feature (specifically the SET_VHOST_LANG_PACKAGE function) allows attackers to execute arbitrary code with root privileges. This is a privilege escalation issue affecting cPanel versions prior to 64.0.21.

MitigationUpgrade cPanel to version 64.0.21 or later to remediate this vulnerability. Verify all services function correctly after the upgrade.

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
CpanelApplication
Affected:>= 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, < 64.0.21

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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/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 checks

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

  1. Confirm cPanel is installed
    Check for the presence of /usr/local/cpanel directory or run: ls -la /usr/local/cpanel
    Affected if The /usr/local/cpanel directory does not exist (cPanel is not installed)
  2. Retrieve the installed cPanel version
    Run: cat /usr/local/cpanel/version or cpanel -V
    Affected if Unable to read the version file (cPanel may not be fully installed)
  3. Compare your version against affected ranges
    Match the installed version number to these vulnerable ranges: 55.9999.61 to 56.0.49, 57.9999.48 to 58.0.49, 59.9999.58 to 60.0.43, 61.9999.55 to 62.0.24, or 63.9999.74 to 64.0.21
    Affected if Your installed version falls within any of these ranges (e.g., 63.9999.80 or 60.0.10)
  4. Verify the multilang adminbin feature exposure
    Check if /usr/local/cpanel/bin/adminbin exists and is executable by reviewing: ls -la /usr/local/cpanel/bin/adminbin
    Affected if The adminbin binary exists and is accessible (the vulnerable SET_VHOST_LANG_PACKAGE function can be reached through this binary)

You are affected if cPanel is installed and the version number is less than 64.0.21 but within one of the affected version ranges listed above.

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
Upgrade available Upgrade to 56.0.49 / 58.0.49 / 60.0.43 or later
Fixed in 56.0.4958.0.4960.0.43
Interim mitigation

Upgrade cPanel to version 64.0.21 or later to remediate this vulnerability. Verify all services function correctly after the upgrade.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,720
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,752.

Scan for this in your stack

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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-2017-18434 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
  • No spam, self-promotion, credentials, or personal data