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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0425
Multiple vulnerabilities in NetScaler ADC and NetScaler Gateway

Original Issue Date:August 27, 2026

Severity Rating: CRITICAL

Software Affected

  • NetScaler ADC and NetScaler Gateway 14.1 before 14.1-73.32
  • NetScaler ADC and NetScaler Gateway 13.1 before 13.1-63.21
  • NetScaler ADC FIPS before 14.1-73.32 FIPS
  • NetScaler ADC FIPS and NDcPP before 13.1-37.277

Overview

Multiple vulnerabilities have been reported in NetScaler ADC and NetScaler Gateway, which could allow an attacker to cause denial of service, bypass authentication and gain unauthorized access to the targeted system.

Target Audience:
All end-user organizations and individuals using affected versions of NetScaler ADC and NetScaler Gateway.

Risk Assessment:
High risk of denial of service and authentication bypass.

Impact Assessment:
Potential for denial of service, authentication bypass, unauthorized access, and compromise of affected systems.

Description

NetScaler ADC is a network appliance used for application delivery and security, while NetScaler Gateway provides secure remote access to enterprise resources.

Multiple vulnerabilities have been reported in NetScaler ADC and NetScaler Gateway due to a memory overflow vulnerability associated with SIP ALG enabled on a Large Scale NAT (LSN) group and an authentication bypass vulnerability using an alternate authentication path in appliance configured as Gateway/AAA virtual server.

Successful exploitation of these vulnerabilities could allow an attacker to cause denial of service, bypass authentication and gain unauthorized access to the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939

Vendor Information

NetScaler
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939

References

 
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939

CVE Name
CVE-2026-19489
CVE-2026-19490

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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