CVE-2025-7775: Citrix NetScaler memory overflow in ADC and Gateway

CVE-2025-7775 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2025-08-26

Citrix NetScaler ADC and Gateway, which are used to manage network traffic and provide secure remote access (VPN), contain a critical vulnerability. An attacker can exploit this flaw to take control of the device or crash it, potentially leading to a total service outage or unauthorized access to corporate resources. This vulnerability is reportedly being exploited in the wild, making immediate patching essential.

Technologies: Citrix NetScaler, Citrix NetScaler ADC, Citrix NetScaler Gateway. Vendors: Citrix.

Quick answers

Is CVE-2025-7775 exploited in the wild?
Yes. CVE-2025-7775 is known to be exploited in the wild, first recorded on 26 August 2025. Treat it as urgent.
How severe is CVE-2025-7775?
Critical severity, with a CVSS score of 9.8, published 26 August 2025.
Which products and versions are affected?
Citrix NetScaler ADC 13.1 before 13.1-59.22, 14.1 before 14.1-47.48, 12.1/13.1 FIPS/NDcPP before fixed versions; Citrix NetScaler Gateway 13.1 before 13.1-59.22, 14.1 before 14.1-47.48.
Is there a fix for CVE-2025-7775?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2025-7775 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2025-7775?
Check whether you run Citrix NetScaler, Citrix NetScaler ADC or Citrix NetScaler Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A memory overflow vulnerability (CWE-119) exists in Citrix NetScaler ADC and NetScaler Gateway. The flaw is triggered when the device is configured as a Gateway (VPN, ICA Proxy, CVPN, RDP Proxy), an AAA virtual server, or when Load Balancing (LB) virtual servers (HTTP, SSL, or HTTP_QUIC) are bound with IPv6 services. An unauthenticated remote attacker can exploit this to achieve remote code execution (RCE) or cause a denial of service (DoS). The vulnerability is confirmed to be exploited in the wild and is listed in the CISA KEV catalog. Patches are available in versions 13.1-59.22, 14.1-47.48, and updated FIPS/NDcPP releases.

Affected products

  • Citrix NetScaler ADC 13.1 before 13.1-59.22, 14.1 before 14.1-47.48, 12.1/13.1 FIPS/NDcPP before fixed versions
  • Citrix NetScaler Gateway 13.1 before 13.1-59.22, 14.1 before 14.1-47.48

Timeline

  • 2025-08-26: disclosed: Initial disclosure by Citrix and NVD publication
  • 2025-08-26: kev added: Added to CISA Known Exploited Vulnerabilities catalog
  • 2025-08-26: exploited: Reported as exploited in the wild at time of disclosure

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