CVE-2026-8452

Published Jun 30, 2026

Last updated 2 months ago

Exploit known CVSS high 8.8

VDI

web application

Network

Zero-day

SSL

Server

Port (53)

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-8452 is identified as a memory overflow vulnerability impacting Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway appliances. This flaw can result in unpredictable or erroneous behavior and may lead to a Denial of Service (DoS) condition. The vulnerability is present when the appliance is configured as a Gateway, supporting functions such as SSL VPN, ICA Proxy, Clientless VPN (CVPN), or RDP Proxy, or when it operates as an AAA virtual server. The vulnerability is reachable over the network and does not require authentication or user interaction for exploitation. In some configurations, particularly involving the SSL VPN portal component and a malformed TLS handshake, it has been described as a pre-authentication Remote Code Execution (RCE) vulnerability, stemming from a heap overflow in the SAML message normalization process. This can allow an attacker to trigger memory corruption and potentially install a webshell with root privileges.

Description: Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server
Source: 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
NVD status: Analyzed
Products: netscaler_application_delivery_controller, netscaler_gateway

Risk scores

CVSS 4.0

Type: Secondary
Base score: 8.8
Impact score: -
Exploitability score: -
Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: HIGH

CVSS 3.1

Type: Primary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Exploit added on: Aug 26, 2026
Exploit action due: Aug 29, 2026
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-119

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.