CVE-2025-6543
Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
CVSS
—
No CVSS
EPSS
10.6%
p96
KEV
YES
Jun 30, 2025
Exploit Today
79
0-100
Published: — · Last modified: —
Product
Citrix / NetScaler ADC and Gateway
Vulnerability
Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
Added to KEV
Jun 30, 2025
Remediate by
Jul 21, 2025
Known ransomware use
No
Summary 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.
Notes
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