Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
High Listed in CISA KEV
Summary
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.
In-depth triage · Auto channel
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- Citrix:NetScaler ADC and Gateway
Sources
- CISA KEV DATABASE
Original Links
- https://nvd.nist.gov/vuln/detail/CVE-2025-6543 advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog kev
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 reference
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ reference
Timeline
- kev_added CISA KEV
- kev_ingest CISA KEV