CVE-2025-6543
CISA KEVPublished June 30, 2025 · Updated April 3, 2026
high
Official 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.
Affected Products
| Vendor | Product |
|---|---|
| Citrix | NetScaler ADC and Gateway |
Patch Status
Patch by 2025-07-21
Recommended Actions
- Check if your systems use any of the affected products listed above.
- Apply vendor patches immediately if available.
- This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
- Monitor vendor advisories for updates and additional mitigations.
- Review logs for indicators of compromise related to CVE-2025-6543.