Threat level Severe
Contact
Critical 9.8Actively exploited
CVE-2026-8452

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

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)…

WeaknessCWE-119: Memory corruption
Published Updated Source NVD and CISA KEV
Read vendor advisoryView on NVD
CVSS 3.1
9.8
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit chance, 30 days
1.0%
Higher than 63% of all CVEs (EPSS)
Status
Actively exploited
On CISA KEV since 26 Aug 2026
Patch
Unknown
Check the vendor advisory

What happened

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

What to do

  1. 01Check whether you run Citrix NetScaler ADC and NetScaler Gateway, and which version.
  2. 02Follow the vendor advisory for a fix or a workaround.
  3. 03Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA deadlineUS federal agencies must remediate by

References

Timeline · UTC

  1. Published to NVD
  2. Added to CISA KEV
  3. NVD record updated
  4. CISA remediation deadline

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Vendor
Citrix0 CVEs in 30 days
All Citrix CVEs

Other CVEs from Citrix

4 more CVEs, 4 actively exploited

All Citrix CVEs
7.5Citrix NetScaler — Improper Restriction of Operations within the Bounds of a Memory Buffer.ExploitedEPSS 11%8.1Citrix NetScaler — Improper Restriction of Operations within the Bounds of a Memory Buffer.ExploitedEPSS 78%9.8Citrix NetScaler — Improper Input Validation.ExploitedEPSS 82%9.8Citrix NetScaler — Authentication Bypass Using an Alternate Path or Channel.ExploitedEPSS 33%