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CVE-2026-8452

Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer

9.8 CRITICALActively exploited (CISA KEV)EPSS 1.01%
  1. Published30 Jun 2026
  2. Added to CISA KEV26 Aug 2026
  3. Remediation due29 Aug 2026
Actively exploited (CISA KEV)

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service.

Added to KEV: 26 Aug 2026Federal remediation due: 29 Aug 2026

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-63.18 · ≥ 14.1 < 14.1-72.61 · 14.1-66.68 · < 13.1-37.272
Citrix NetScaler Gateway≥ 13.1 < 13.1-63.18 · ≥ 14.1 < 14.1-72.61

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-63.18
Citrix NetScaler Gateway≥ 13.1-63.18

References

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Frequently asked

Is CVE-2026-8452 being actively exploited?

Yes. CVE-2026-8452 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 26 Aug 2026.

How severe is CVE-2026-8452?

CVE-2026-8452 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-8452?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-8452?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-63.18, Citrix NetScaler Gateway 13.1-63.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-8452 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.