CVE-2025-6543

9.8 CRITICAL CISA KEV - Actively Exploited

Published: June 25, 2025 Modified: October 24, 2025

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

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788

Source: secure@citrix.com

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

2 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

2.3%

84th percentile

Exploitation Status

Actively Exploited

Remediation due: 2025-07-21

Weaknesses (CWE)

CWE-119

Affected Vendors

citrix

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