CVE-2025-6543
CriticalActively exploited (CISA KEV)
Description
Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
SeverityCritical
CVSS9.8
Exploit probability—
Product
Citrix NetScaler ADC and Gateway
PublishedJun 25, 2025
First seenJun 25, 2025
Added to KEVJun 30, 2025
Weakness typeCWE-119Memory buffer bounds error
How to fix
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: Jul 21, 2025Update
- citrix netscaler_application_delivery_controller13.1-37.236, 13.1-59.19, 14.1-47.46 or later
- citrix netscaler_gateway13.1-59.19, 14.1-47.46 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| citrix netscaler_application_delivery_controller | 13.1 ≤ v < 13.1-37.236, 13.1 ≤ v < 13.1-59.19, 14.1 ≤ v < 14.1-47.46 | 13.1-37.236, 13.1-59.19, 14.1-47.46 |
| citrix netscaler_gateway | 13.1 ≤ v < 13.1-59.19, 14.1 ≤ v < 14.1-47.46 | 13.1-59.19, 14.1-47.46 |
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