CVE-2025-6543
9.8 · CRITICAL Actively ExploitedOverview
CVE-2025-6543 is a critical-severity vulnerability affecting citrix netscaler_application_delivery_controller. It was published on June 25, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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
Remediation
Check the references section for vendor advisories and patches from citrix. Update netscaler_application_delivery_controller to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| citrix | netscaler_application_delivery_controller | >= 13.1, < 13.1-37.236 | Affected |
| citrix | netscaler_gateway | >= 13.1, < 13.1-59.19 | Affected |
Frequently Asked Questions
What is CVE-2025-6543?
CVE-2025-6543 is a critical-severity vulnerability affecting citrix netscaler_application_delivery_controller. It was published on June 25, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2025-6543?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-6543?
Check the references section for vendor advisories and patches from citrix. Update netscaler_application_delivery_controller to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-6543?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-6543 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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