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Multiple vulnerabilities in NetScaler ADC and NetScaler Gateway

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

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

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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