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Netscaler Application Delivery ControllerApplication · Citrix

CVE-2024-8534

HIGH · 8.1 CVSS v3.1 Published 2024-11-12
Fix available
A fix is available. Upgrade to 12.1-55.321 / 13.1-37.207 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
Memory safety vulnerability leading to memory corruption and Denial of Service in NetScaler ADC and Gateway if the appliance must be configured as a Gateway (VPN Vserver) with RDP Feature enabled OR the appliance must be configured as a Gateway (VPN Vserver) and RDP Proxy Server Profile is created and set to Gateway (VPN Vserver) OR the appliance must be configured as a Auth Server (AAA Vserver) with RDP Feature enabled

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

Memory safety vulnerability in NetScaler ADC and Gateway allows memory corruption leading to denial of service when specific RDP-related configurations are enabled: either a Gateway (VPN Vserver) with RDP Feature enabled, a Gateway with RDP Proxy Server Profile bound to it, or an Auth Server (AAA Vserver) with RDP Feature enabled.

MitigationApply the vendor-provided patch from Citrix for NetScaler ADC/Gateway. If immediate patching is not possible, consider disabling RDP-related features on affected VPN/AAA vservers as a temporary mitigation until the patch can be applied.

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:>= 12.1, < 12.1-55.321>= 12.1, < 13.1-55.34>= 13.1, < 13.1-37.207>= 14.1, < 14.1-29.72
Netscaler GatewayApplication
Affected:>= 12.1, < 13.1-55.34>= 14.1, < 14.1-29.72

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. Identify NetScaler ADC version
    Run command: show version or nsversion
    Affected if Version is 12.1 before 12.1-55.321, or 13.1 before 13.1-55.34/13.1-37.207, or 14.1 before 14.1-29.72
  2. Identify NetScaler Gateway version
    Run command: show version or nsversion (if Gateway is deployed as a separate instance)
    Affected if Version is 12.1 before 13.1-55.34, or 14.1 before 14.1-29.72
  3. Check Gateway VPN vservers for RDP Feature
    Run: show vpn vserver - output shows RDPStatus or RDPEnabled field under each vserver. Look for Gateway vservers with RDP feature active
    Affected if Any Gateway (VPN Vserver) has RDP feature enabled
  4. Check Gateway vservers for bound RDP Proxy Server Profiles
    Run: show rdpprofile to list profiles, then for each Gateway vserver run: show vpn vserver <name> and check RDPProxyProfile binding
    Affected if Any Gateway vserver has an RDP Proxy Server Profile bound to it
  5. Check AAA vservers for RDP Feature
    Run: show aaa vserver - examine each AAA Vserver for RDP-related settings such as RDPEnabled or RDPStatus
    Affected if Any Auth Server (AAA Vserver) has RDP feature enabled

Environment is affected if running an unpatched version AND any Gateway VPN vserver has RDP enabled, any Gateway has an RDP Proxy Server Profile bound, or any AAA vserver has RDP enabled.

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 12.1-55.321 / 13.1-37.207 / 13.1-55.34 or later
Fixed in 12.1-55.32113.1-37.20713.1-55.34
Interim mitigation

Apply the vendor-provided patch from Citrix for NetScaler ADC/Gateway. If immediate patching is not possible, consider disabling RDP-related features on affected VPN/AAA vservers as a temporary mitigation until the patch can be applied.

Recommended fix High confidence

NetScaler ADC 12.1 -> 12.1-55.321; ADC 13.1 -> 13.1-55.34 or 13.1-37.207; ADC/Gateway 14.1 -> 14.1-29.72

  1. 1. Identify the current NetScaler ADC or Gateway version by running 'show version' or checking the management console
  2. 2. For NetScaler ADC 12.1: Upgrade to version 12.1-55.321 or later
  3. 3. For NetScaler ADC 13.1: Upgrade to version 13.1-55.34 or later (or 13.1-37.207 or later for the 13.1-37 branch)
  4. 4. For NetScaler ADC 14.1: Upgrade to version 14.1-29.72 or later
  5. 5. For NetScaler Gateway 13.1: Upgrade to version 13.1-55.34 or later
  6. 6. For NetScaler Gateway 14.1: Upgrade to version 14.1-29.72 or later
  7. 7. After upgrade, verify the fix by confirming the appliance does not have the vulnerable RDP configurations listed in the CVE description
  8. 8. Alternatively, if upgrading is not immediately possible, ensure the appliance is NOT configured as: (a) Gateway (VPN Vserver) with RDP Feature enabled, (b) Gateway with RDP Proxy Server Profile set to Gateway, or (c) Auth Server (AAA Vserver) with RDP Feature enabled
Caveat Review release notes for potential compatibility issues before upgrading; some configuration changes may be required between major versions

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

Fix this in Netscaler Application Delivery Controller Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2024-8534 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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