# CVE-2026-8452: NetScaler ADC and Gateway memory overflow in Gateway or AAA virtual server

Source: https://junglewise.ai/threats/cve-2026-8452-netscaler-adc-and-gateway-memory-overflow-in-gateway-or-aaa  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-30. Updated: 2026-09-24  
License: CC BY 4.0 with a link back

CVE-2026-8452 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2026-06-30

Citrix NetScaler ADC and NetScaler Gateway are critical infrastructure appliances used to manage and secure network traffic in enterprise environments. A buffer overflow vulnerability in these products allows attackers to crash the affected systems, causing widespread network outages and service disruption across dependent applications and users. This vulnerability has been actively exploited in the wild, making remediation urgent.

Technologies: [Citrix NetScaler ADC](https://junglewise.ai/threats/technologies/netscaler-adc), [Citrix NetScaler Gateway](https://junglewise.ai/threats/technologies/gateway). Vendors: [Citrix](https://junglewise.ai/threats/vendors/citrix).

## Quick answers

**Is CVE-2026-8452 exploited in the wild?** Yes. CVE-2026-8452 is known to be exploited in the wild, first recorded on 26 August 2026. Treat it as urgent.

**How severe is CVE-2026-8452?** Critical severity, with a CVSS score of 8.8, published 30 June 2026.

**Which products and versions are affected?** Citrix NetScaler ADC; Citrix NetScaler Gateway.

**Is there a fix for CVE-2026-8452?** 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-2026-8452 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-8452?** Check whether you run Citrix NetScaler ADC or Citrix NetScaler Gateway. 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

The vulnerability is a classic buffer overflow (improper restriction of operations within memory buffer bounds) affecting Citrix NetScaler ADC and NetScaler Gateway. The root cause involves insufficient bounds checking in a core component that processes network operations. The attack vector is network-based, allowing remote exploitation without authentication. Attackers can craft malicious network requests to trigger the overflow condition, causing denial of service through application crash. The vulnerability has been observed in active exploitation campaigns. Citrix has released patches; users should prioritize immediate deployment.

## Affected products

- Citrix NetScaler ADC
- Citrix NetScaler Gateway

## Timeline

- 2026-08-26: disclosed
- exploited: Actively exploited in the wild

## Related threats

- [Citrix NetScaler ADC memory overflow in LDAP authentication](https://junglewise.ai/threats/cve-2026-111342-memory-overflow-in-ldap-authentication-can-lead-to-unpredictable)
- [Citrix NetScaler memory overflow in client-certificate authentication](https://junglewise.ai/threats/cve-2026-111341-memory-overflow-in-client-certificate-authentication-can-lead-to)
- [Citrix NetScaler memory overflow in KBA authentication](https://junglewise.ai/threats/cve-2026-111340-memory-overflow-in-kba-knowledge-based-authentication-can-lead)
- [Citrix NetScaler ADC memory overflow in Email OTP authentication](https://junglewise.ai/threats/cve-2026-107415-memory-overflow-in-email-otp-authentication-can-lead-to)
- [Citrix NetScaler ADC memory overflow in WebAuth authentication](https://junglewise.ai/threats/cve-2026-107414-memory-overflow-in-webauth-authentication-can-lead-to)