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CpanelApplication

CVE-2016-10803

HIGH · 7.5 CVSS v3.0 Published 2019-08-07
Fix available
A fix is available. Upgrade to 57.9999.105 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges 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 57.9999.105 allows newline injection via LOC records (CPANEL-6923).

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

A newline injection vulnerability in cPanel versions before 57.9999.105 allows attackers to inject newline characters via DNS LOC (location) records. This input validation failure could enable log injection, email header injection, or other injection attacks depending on how the LOC record data is processed and displayed within the cPanel interface.

MitigationUpdate cPanel to version 57.9999.105 or later. If immediate patching is not possible, implement input validation to strip or reject newline characters (\r, \n) in LOC record field processing.

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:>= 57.9999.48, < 57.9999.105

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
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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. Determine installed cPanel version
    Run command: /usr/local/cpanel/cpanel -V or cat /usr/local/cpanel/version
    Affected if Version number is 57.9999.48 or higher but lower than 57.9999.105 (e.g., 57.9999.48 through 57.9999.104)
  2. Verify DNS service is active
    Check if cPanel DNS services are running: systemctl status named or ps aux | grep named
    Affected if DNS service is enabled and running, which allows processing of DNS records including LOC records
  3. Identify DNS zones with LOC records
    Search zone files in /var/named/ or use cPanel API: whmapi1 dumpzone domain=yourdomain.com | grep LOC
    Affected if Any DNS zones contain LOC records that can be created or modified through cPanel interface or API

If cPanel version falls within 57.9999.48 to 57.9999.104 and the system processes DNS zones with LOC records, the newline injection vulnerability is present.

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 57.9999.105 or later
Fixed in 57.9999.105
Interim mitigation

Update cPanel to version 57.9999.105 or later. If immediate patching is not possible, implement input validation to strip or reject newline characters (\r, \n) in LOC record field processing.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.

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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-2016-10803 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