CVE-2025-6543 — Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
2025-06-30 • CISA Known Exploited Vulnerability
[event] 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.
> AFFECTED SOFTWARE
| Field | Value |
|---|---|
| Vendor | Citrix |
| Product | NetScaler ADC and Gateway |
| CWE | CWE-119 |
| CVE ID | CVE-2025-6543 |
| Date Added | 2025-06-30 |
| Due Date | 2025-07-21 |
| Ransomware Campaign | Unknown |
> MITIGATION
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Due Date: 2025-07-21