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Netscaler Application Delivery ControllerApplication · Citrix

CVE-2023-4967

HIGH · 7.5 CVSS v3.1 Published 2023-10-27
Fix available
A fix is available. Upgrade to 13.0-92.19 / 13.1-49.15 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
Denial of Service in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA Virtual Server

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 denial of service vulnerability exists in NetScaler ADC and NetScaler Gateway when configured as a Gateway (including VPN virtual server, ICA Proxy, CVPN, or RDP Proxy) or AAA Virtual Server. An unauthenticated remote attacker can exploit this condition to cause a denial of service on the affected virtual server.

MitigationApply the relevant Citrix security update for NetScaler ADC and NetScaler Gateway. Until patches can be applied, consider implementing rate limiting or access controls on affected virtual servers to reduce exposure.

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
Netscaler Application Delivery ControllerApplication
Affected:>= 13.0, < 13.0-92.19>= 13.1, < 13.1-49.15>= 14.1, < 14.1-8.50>= 12.1, <= 12.1-55.300>= 13.1, <= 13.1-37.164
Netscaler GatewayApplication
Affected:>= 13.0, < 13.0-92.19>= 13.1, < 13.1-49.15>= 14.1, < 14.1-8.50

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
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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. Identify NetScaler product and version
    Run 'show version' command on the NetScaler CLI or check the product version in the NetScaler GUI under System > Information > License
    Affected if The installed version is 13.0 before 13.0-92.19, 13.1 before 13.1-49.15, 14.1 before 14.1-8.50, 12.1 up to 12.1-55.300, or 13.1 up to 13.1-37.164
  2. Confirm product type is ADC or Gateway
    Run 'show ns version' or check the licensed product type in NetScaler GUI under System > Licensing
    Affected if The product is NetScaler ADC or NetScaler Gateway
  3. Check for Gateway virtual server configuration
    Run 'show vserver' command and look for VPN virtual servers, ICA Proxy, CVPN, or RDP Proxy types
    Affected if Any virtual server is configured as VPN, ICA Proxy, CVPN, or RDP Proxy type
  4. Check for AAA virtual server configuration
    Run 'show aaa vserver' command to list AAA virtual servers
    Affected if Any AAA virtual server is configured and enabled

You are affected if you are running a vulnerable NetScaler ADC or Gateway version AND have a Gateway virtual server (VPN, ICA Proxy, CVPN, or RDP Proxy) OR an AAA virtual server configured.

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 13.0-92.19 / 13.1-49.15 / 14.1-8.50 or later
Fixed in 13.0-92.1913.1-49.1514.1-8.50
Interim mitigation

Apply the relevant Citrix security update for NetScaler ADC and NetScaler Gateway. Until patches can be applied, consider implementing rate limiting or access controls on affected virtual servers to reduce exposure.

Recommended fix High confidence

Upgrade to the minimum fixed build for your branch: 13.0-92.19 (13.0 branch), 13.1-49.15 (13.1 branch), 14.1-8.50 (14.1 branch), or latest available for 12.1

  1. 1. Identify the currently installed NetScaler ADC or Gateway version via the CLI command 'show version' or the GUI under System > Information
  2. 2. Determine which version branch you are running (12.1, 13.0, 13.1, or 14.1)
  3. 3. For version 12.1: Upgrade to the latest available build (12.1-55.300 or later if available) as this branch has limited remaining support
  4. 4. For version 13.0: Upgrade to build 13.0-92.19 or later
  5. 5. For version 13.1: Upgrade to build 13.1-49.15 or later
  6. 6. For version 14.1: Upgrade to build 14.1-8.50 or later
  7. 7. After upgrade, verify the fix by checking 'show version' confirms the new build number
  8. 8. Test that Gateway services (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) and AAA Virtual Server are functioning normally
Caveat Review Citrix release notes for your target version; major version upgrades (e.g., 12.1 to 14.1) may introduce configuration or feature changes requiring testing

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

Fix this in Netscaler Application Delivery Controller Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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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-2023-4967 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