CVE-2025-6543

NetScaler ADC, NetScaler Gateway

Published 25 Jun 2025 · updated 17 Jun 2026 · Analyzed

9.2 Critical · CVSS 4.0, citrix.com

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 30 Jun 2025, with a remediation deadline of 21 Jul 2025 for US federal agencies.

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.

Description

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

References

support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 · Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543 · US Government Resource