Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

Description

Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

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.

References

• https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788
• https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
• https://nvd.nist.gov/vuln/detail/CVE-2025-6543

Additional Information

Catalog Version

2025.06.30

Catalog Released

June 30, 2025

Days Until Due

0 days

Last Updated

3 weeks, 5 days ago