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THE THREAT On September 8th, 2025, a large-scale supply chain attack was confirmed, affecting at least 25 widely used npm packages, collectively downloaded over two billion…
THE THREATA critical security advisory has been issued for NetScaler ADC and Gateway systems, highlighting three significant vulnerabilities (CVE-2025-7775, CVE-2025-7776, and…
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A critical security advisory has been issued for NetScaler ADC and Gateway systems, highlighting three significant vulnerabilities (CVE-2025-7775, CVE-2025-7776, and CVE-2025-8424) that could allow Remote Code Execution (RCE), Denial-of-Service (DoS) attacks, and unauthorized access to management interfaces. Citrix confirmed that active exploitation has been observed in the wild for CVE-2025-7775 (CVSS: 9.2), making immediate patching crucial. Affected customers running versions 14.1, 13.1, and FIPS/NDcPP variants must upgrade to the latest patched versions as soon as possible, as no workarounds are available. The vulnerabilities specifically impact customer-managed installations, while cloud-managed services are automatically updated by Citrix.
Additional information
CVE-2025-7775 presents a memory overflow condition that can lead to pre-authenticated RCE and DoS. The flaw particularly affects systems configured as Gateway services (VPN virtual server, ICA Proxy, CVPN, RDP Proxy), AAA virtual servers, or those utilizing specific IPv6 configurations with HTTP, SSL, or HTTP_QUIC load balancing virtual servers. At the time of writing, no technical details related to the exploit are available, though researcher Kevin Beaumont has suggested it may have been exploited to deploy webshells.
Two additional vulnerabilities compound the risk: CVE-2025-7776 (CVSS 8.8) targets systems with PCoIP Profile configurations, causing memory overflow issues and potential system instability, while CVE-2025-8424 (CVSS 8.7) exposes a significant access control vulnerability in the NetScaler Management Interface, potentially affecting any system with access to NSIP, Cluster Management IP, or local GSLB Site IP configurations. All supported versions are affected, including NetScaler ADC and Gateway 14.1 (pre-14.1-47.48), 13.1 (pre-13.1-59.22), and various FIPS/NDcPP implementations.
Immediate patching is critical for all customer-managed installations, as no workarounds exist. Organizations running older versions 12.1 and 13.0, now End of Life (EoL), must upgrade to supported versions immediately. The vulnerabilities impact systems using authentication servers (AAA vServer), Gateway configurations, specific load balancing configurations with IPv6 services, and CR virtual servers with HDX types. While customer-managed systems require manual updating, Citrix-managed cloud services and Adaptive Authentication implementations are being automatically patched by Cloud Software Group.
Earlier this year, threat actors targeted Citrix NetScaler ADC and NetScaler Gateway, reportedly exploiting critical vulnerabilities, CVE-2025-6543 (CVSS 9.2) and CVE-2025-5777 (CVSS: 9.3), in the wild as of June 2025. Given the severity, confirmed exploitation, and continued threat actor interest in Citrix appliances, organizations should urgently mitigate CVE-2025-7775 by applying the relevant security patches immediately.
Impacted Versions List:
References:
[1] https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938&articleTitle=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2025_7775_CVE_2025_7776_and_CVE_2025_8424
[2] https://www.cve.org/CVERecord?id=CVE-2025-7775
[3] https://github.com/NCSC-NL/citrix-2025/tree/main/live-host-bash-check
[4] https://cyberplace.social/@GossiTheDog/115095063936712306
[5] https://www.cve.org/CVERecord?id=CVE-2025-7776
[6] https://www.cve.org/CVERecord?id=CVE-2025-8424
[7] https://www.esentire.com/security-advisories/actively-exploited-citrix-vulnerability-cve-2025-6543
[8] https://nvd.nist.gov/vuln/detail/CVE-2025-6543
[9] https://nvd.nist.gov/vuln/detail/CVE-2025-5777