CVE intelligenceCISA KEVRansomware use

CVE-2023-3519

Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability

Published Jul 19, 2023Sources checked Oct 28, 2026

9.8CRITICALCVSS out of 10

What this means

Actively exploited

CISA lists CVE-2023-3519 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to Citrix NetScaler ADC and NetScaler Gateway.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Public exploit: Cataloged public exploit.

Rapid7 Metasploit: Citrix ADC (NetScaler) Forms SSO Target RCE (2026-09-23 21:40:29.350562+00)
Rapid7 catalogs an exploit module for this CVE. Module availability does not establish exploitation in the wild or applicability to your environment.

CISA KEVListedObserved exploitation

EPSS99.7%Estimated 30-day exploitation probability

Ransomware useReported by CISACISA KEV ransomware field

Threat actors1Source-linked actor relationships

Overview

What is CVE-2023-3519?

Unauthenticated remote code execution

Source: NVD

CISA says:Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA catalog due date Aug 9, 2023