CVE-2026-8452: Citrix NetScaler ADC And NetScaler Gateway

What is CVE-2026-8452?

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

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS1% · P62

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWECWE-119

NVD published2026-06-30

NVD last modified2026-08-27

Timeline

2026-06-30Published to the U.S. National Vulnerability Database (NVD)
2026-08-26Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-08-27NVD record last updated
2026-08-29CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

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

Added to KEV2026-08-26

Federal patch deadline2026-08-29

Known ransomware useUnknown

Affected product

Citrix NetScaler ADC And NetScaler Gateway

NVD also lists CPE entries for: Citrix Netscaler Application Delivery Controller, Citrix Netscaler Gateway

Remediation Steps

Apply the vendor security update for Citrix NetScaler ADC and NetScaler Gateway as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
Vulnerability Priority Report – Week 4 of August 2026 (August 24 – 30)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.