Detections
Analytics

NetScaler ADC and NetScaler Gateway Multiple Vulnerabilities (CTX696939)

critical Nessus Plugin ID 338328

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Synopsis

The remote device is affected by multiple vulnerabilities.

Description

The remote NetScaler ADC (formerly Citrix ADC) or NetScaler Gateway (formerly Citrix Gateway) device is 13.1 prior to 13.1-63.21, or 14.1 prior to 14.1-73.32, or 13.1-FIPS/NDcPP prior to 13.1-37.277, or 14.1-FIPS prior to 14.1-73.32. It is, therefore, affected by multiple vulnerabilities:

 - Authentication bypass using an alternate path in NetScaler ADC and NetScaler Gateway when the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or an AAA virtual server, subject to version-specific SAML action requirements. (CVE-2026-19490)

 - Memory overflow vulnerability in NetScaler ADC and NetScaler Gateway leading to unpredictable behavior or Denial of Service if SIP ALG (Session Initiation Protocol Application Layer Gateway) is enabled on a Large Scale NAT (LSN) group configuration. (CVE-2026-19489)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to NetScaler ADC or NetScaler Gateway version 13.1-63.21, 14.1-73.32, 13.1-37.277-FIPS, 13.1-37.277-NDcPP, or 14.1-73.32-FIPS or later.

See Also

http://www.nessus.org/u?d6e67cff

Plugin Details

Severity: Critical

ID: 338328

File Name: netscaler_adc_gateway_CTX696939.nasl

Version: 1.5

Type: Combined

Family: CGI abuses

Published: 8/20/2026

Updated: 9/10/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.6

Percentile: 99.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-19490

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 9.3

Threat Vector: CVSS:4.0/E:A

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Vulnerability Information

CPE: cpe:/h:citrix:netscaler_application_delivery_controller, cpe:/h:citrix:netscaler_gateway

Required KB Items: Host/NetScaler/Detected

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/19/2026

Vulnerability Publication Date: 8/19/2026

Reference Information

CVE: CVE-2026-19489, CVE-2026-19490

CWE: 119, 288

IAVA: 2026-A-0861