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Client ConnectorApplication · Zscaler

CVE-2024-23463

HIGH · 8.1 CVSS v3.1 Published 2024-04-30
Fix available
A fix is available. Upgrade to 4.2.1 or later.
See remediation →
90/100
Remediation priority · Urgent
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
Anti-tampering protection of the Zscaler Client Connector can be bypassed under certain conditions when running the Repair App functionality. This affects Zscaler Client Connector on Windows prior to 4.2.1

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

The anti-tampering mechanism in Zscaler Client Connector for Windows can be circumvented when the Repair App functionality is invoked, allowing protection bypass prior to version 4.2.1.

MitigationUpgrade Zscaler Client Connector to version 4.2.1 or later to remediate the anti-tampering bypass vulnerability.

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
Client ConnectorApplication
Affected:< 4.2.1

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/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. Check installed Zscaler Client Connector version
    Open Windows Control Panel or Settings > Apps & Features, locate Zscaler Client Connector, and note the installed version number. Alternatively, open PowerShell and run: Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*' | Where-Object {$_.DisplayName -like '*Zscaler*'} | Select-Object DisplayName, DisplayVersion
    Affected if The displayed version number is less than 4.2.1 (for example, 4.2.0, 4.1.x, or earlier)
  2. Verify Repair App feature availability
    Open Zscaler Client Connector interface, navigate to Settings or Help section, and look for a Repair App or Repair Installation option. Document whether this functionality is present and accessible to users.
    Affected if The Repair App functionality is present and available in the installed version, enabling the anti-tampering bypass pathway
  3. Confirm anti-tampering protection status
    Open Zscaler Client Connector, go to Settings or Status panel, and check if tamper protection or integrity monitoring is enabled and active. Look for indicators such as 'Protection Active', 'Tamper Proof', or similar status messages.
    Affected if Tamper protection appears disabled, misconfigured, or fails to prevent the Repair App function from bypassing protection mechanisms

You are affected if Zscaler Client Connector version is below 4.2.1 and the Repair App functionality can be invoked, allowing the anti-tampering mechanism to be bypassed.

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.

dbcve · scoped
Upgrade available Upgrade to 4.2.1 or later
Fixed in 4.2.1
Interim mitigation

Upgrade Zscaler Client Connector to version 4.2.1 or later to remediate the anti-tampering bypass vulnerability.

Recommended fix High confidence

4.2.1

  1. Check the current Zscaler Client Connector version by opening the application and navigating to Settings > About, or by right-clicking the Client Connector icon in the system tray and selecting About
  2. Download the Zscaler Client Connector version 4.2.1 or later from the official Zscaler download portal at help.zscaler.com or your organization's Zscaler admin console
  3. Run the installer with administrator privileges
  4. Follow the on-screen prompts to complete the upgrade process
  5. Restart the system if prompted by the installer
  6. Verify the installed version is 4.2.1 or later by checking the About section in the Client Connector

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Client Connector Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

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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-2024-23463 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