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Netscaler Application Delivery ControllerApplication · Citrix

CVE-2026-8452

CRITICAL · 9.8 CVSS v3.1 Published 2026-06-30
Fix available
A fix is available. Upgrade to 13.1-37.272 / 13.1-63.18 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 8 weeks old

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 NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

In the news

Third-party coverage
Trending covered by 2 outlets this week · latest 1mo ago

Surfaced from public web coverage — external links open in a new tab.

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 overflow vulnerability in NetScaler ADC and NetScaler Gateway that causes unpredictable or erroneous behavior and Denial of Service when the appliance is configured as a Gateway virtual server (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

MitigationRestrict or disable Gateway and AAA virtual server configurations until vendor patches are applied; implement network segmentation to limit exposure of affected NetScaler deployments.

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:< 13.1-37.272>= 13.1, < 13.1-63.18>= 14.1, < 14.1-72.61= 14.1-66.68
Netscaler GatewayApplication
Affected:>= 13.1, < 13.1-63.18>= 14.1, < 14.1-72.61

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. Identify NetScaler product type and version
    Run 'show version' or 'nsapimgr -r' from the NetScaler command line to obtain the exact build number and version
    Affected if The installed version falls within any of these ranges: < 13.1-37.272, >=13.1 and <13.1-63.18, >=14.1 and <14.1-72.61, or =14.1-66.68
  2. Confirm if Gateway virtual server is configured
    Run 'show gateway vserver' or 'show vserver | grep -i gateway' to list all configured Gateway virtual servers (includes SSL VPN, ICA Proxy, CVPN, RDP Proxy)
    Affected if Any Gateway virtual server is listed in the output with a state other than 'DISABLED'
  3. Confirm if AAA virtual server is configured
    Run 'show aaa vserver' to list all configured AAA virtual servers
    Affected if Any AAA virtual server is listed in the output with a state other than 'DISABLED'

A system is affected if it runs a vulnerable NetScaler ADC or Gateway version AND has at least one active Gateway or 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 13.1-37.272 / 13.1-63.18 / 14.1-72.61 or later
Fixed in 13.1-37.27213.1-63.1814.1-72.61
Interim mitigation

Restrict or disable Gateway and AAA virtual server configurations until vendor patches are applied; implement network segmentation to limit exposure of affected NetScaler deployments.

Recommended fix High confidence

13.1-63.18 or later for 13.1 branch; 14.1-72.61 or later for 14.1 branch

  1. 1. Identify the current NetScaler ADC or NetScaler Gateway version using 'show version' or via the management console
  2. 2. For NetScaler ADC or Gateway version 13.1: Upgrade to version 13.1-63.18 or later
  3. 3. For NetScaler ADC or Gateway version 14.1: Upgrade to version 14.1-72.61 or later
  4. 4. Verify the upgrade completed successfully by checking the version again with 'show version'
  5. 5. Test that Gateway functionality (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server is operational after upgrade
Caveat Standard NetScaler upgrade precautions apply - test in non-production environment first, and schedule maintenance window as upgrade may require reboot

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
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.

Scan for this in your stack

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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-2026-8452 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