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CVE Watch—

CVE-2025-6543

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

CVSS

—

No CVSS

EPSS

10.1%

p95

KEV

YES

Jun 30, 2025

Exploit Today

79

0-100

Published: — · Last modified: —

EPSS · 30d
9.8%EPSS · 30 days10.1%
2026-08-022026-08-31
KEV catalog record

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

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