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Netscaler Application Delivery ControllerApplication · Citrix

CVE-2025-7776

CRITICAL · 9.8 CVSS v3.1 Published 2025-08-26
Fix available
A fix is available. Upgrade to 12.1-55.330 / 13.1-37.241 or later.
See remediation →
100/100
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 overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it

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 memory overflow vulnerability in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, or RDP Proxy) with a PCoIP Profile bound to it. The overflow can lead to unpredictable or erroneous behavior and potentially complete Denial of Service.

MitigationApply vendor patches from Citrix when available. As immediate mitigation, avoid binding PCoIP Profiles to Gateway configurations or temporarily disable Gateway functionality 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, < 12.1-55.330>= 13.1, < 13.1-37.241>= 13.1, < 13.1-59.22>= 14.1, < 14.1-47.48
Netscaler GatewayApplication
Affected:>= 13.1, < 13.1-59.22>= 14.1, < 14.1-47.48

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/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 NetScaler version
    Run 'show version' command from the NetScaler CLI or check System > Diagnostics > Show Version in the GUI. Note the full build number (for example, 13.1-37.47 or 14.1-47.42).
    Affected if The installed version falls within any of these ranges: 12.1 (any build >= 12.1 but < 12.1-55.330); 13.1 (any build >= 13.1 but < 13.1-37.241 OR >= 13.1-59.22 but < 13.1-59.22); 14.1 (any build >= 14.1 but < 14.1-47.48). Note that versions 13.1-37.241 through 13.1-59.21 are also affected.
  2. Verify Gateway configuration exists
    Run 'show vpn vserver' to list all VPN virtual servers, or 'show lb vserver | grep -E "ICA|CVPN|RDP"' to find ICA Proxy, CVPN, or RDP Proxy configured virtual servers.
    Affected if Any VPN virtual server, ICA Proxy, CVPN, or RDP Proxy virtual server is configured and enabled on the appliance.
  3. Check for bound PCoIP Profile
    Run 'show pcoip profile' to list all PCoIP profiles configured. Then for each Gateway vserver identified in step 2, run 'show vpn vserver <name>' or 'show lb vserver <name>' and look for a PCoIP profile bound under the Profile or Advanced Settings section.
    Affected if A PCoIP profile is bound to any Gateway virtual server (VPN, ICA Proxy, CVPN, or RDP Proxy). The vulnerability requires both the Gateway configuration AND the PCoIP profile binding to be present.

The environment is affected only if: (1) the NetScaler ADC or Gateway version is in the affected range, (2) a Gateway-type virtual server (VPN, ICA Proxy, CVPN, or RDP Proxy) is configured, AND (3) a PCoIP Profile is bound to that Gateway configuration. All three conditions must be true for the vulnerability to be exploitable.

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 12.1-55.330 / 13.1-37.241 / 13.1-59.22 or later
Fixed in 12.1-55.33013.1-37.24113.1-59.22
Interim mitigation

Apply vendor patches from Citrix when available. As immediate mitigation, avoid binding PCoIP Profiles to Gateway configurations or temporarily disable Gateway functionality until the patch can be applied.

Recommended fix High confidence

Upgrade to NetScaler 14.1-47.48 (or 13.1-59.22 for 13.x branches, or 12.1-55.330 for 12.x)

  1. Review current NetScaler ADC and Gateway configurations to identify if PCoIP Profile is bound to any VPN virtual server, ICA Proxy, CVPN, or RDP Proxy
  2. Backup current NetScaler configuration before performing upgrade
  3. Download the appropriate fixed build for your current major version: 12.1-55.330, 13.1-59.22, or 14.1-47.48 from the Citrix downloads portal
  4. Upgrade NetScaler ADC/Gateway to the fixed version following standard Citrix upgrade procedures
  5. After upgrade, verify the PCoIP Profile configuration is intact and functioning
  6. Monitor system logs and performance for any anomalies
Caveat Review Citrix release notes for your specific upgrade path as some config migrations may be needed 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
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2025-7776 in production — separate from our analysis above.

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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