Live › vulnerability › CVE-2026-8452
Go to dashboardMemory overflow (CWE-119) in NetScaler ADC/Gateway. Citrix describes it as DoS/unpredictable behaviour, CVSS v4 8.8. It is reachable when the appliance is a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or an AAA vserver. CISA KEV lists it as exploited. watchTowr published a pre-auth RCE writeup and PoC that it believes is this CVE, but Citrix does not map CVEs to researchers, so the link is unconfirmed. The NHS reports exploitation attempts after the PoC. Citrix-managed cloud services are patched by Citrix; this applies to customer-managed appliances.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply 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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Citrix NetScaler ADC and NetScaler Gateway | vendor | – | – |
| NetScaler ADC and NetScaler Gateway | vendor | >= 14.1, < 14.1-72.61; >= 13.1, < 13.1-63.18; 14.1-FIPS < 14.1-72.61 FIPS; 13.1-FIPS and NDcPP < 13.1-37.272 | 14.1-72.61, 13.1-63.18, 14.1-72.61 FIPS, 13.1-37.272 |
| citrix netscaler application delivery controller | vendor | < 13.1-37.272 | 13.1-37.272 |
| citrix netscaler application delivery controller |
| vendor |
| >= 13.1, < 13.1-63.18 |
| 13.1-63.18 |
| citrix netscaler application delivery controller | vendor | >= 14.1, < 14.1-72.61 | 14.1-72.61 |
| citrix netscaler application delivery controller | vendor | = 14.1-66.68 | – |
| citrix netscaler gateway | vendor | >= 13.1, < 13.1-63.18 | 13.1-63.18 |
| citrix netscaler gateway | vendor | >= 14.1, < 14.1-72.61 | 14.1-72.61 |
show running config and search for add vpn vserver (Gateway, ICA Proxy, CVPN, RDP Proxy) or add authentication vserver (AAA)show version against the affected buildsadd authentication samlIdPProfile or SAML actions), treat it as exposed to the watchTowr PoCEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
Posts are quoted with a link to the original. They are data to us, never instructions.
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.
CISA required action: Apply 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.
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CISA KEV catalog, Creative Commons 0 · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.