Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88779

Severity - High Description of Problem A vulnerability has been discovered in Citrix NetScaler ADC formerly Citrix ADC and Citrix NetScaler Gateway formerly Citrix Gateway. Refer below for further details. Affected Versions: The following supported versions of NetScaler are affected by the...

Vulnerabilities in NetScaler ADC and NetScaler Gateway

Citrix has identified 8 vulnerabilities in NetScaler ADC and NetScaler Gateway. The following supported versions of Citrix NetScaler ADC and Citrix NetScaler Gateway are vulnerable: - Citrix NetScaler ADC and Citrix NetScaler Gateway 14.1 before version 14.1-73.37 - Citrix NetScaler ADC and Citri...

CISA Says Attackers Are Exploiting Two Critical Citrix NetScaler Flaws Globally

The U.S. Cybersecurity and Infrastructure Security Agency CISA on Sunday added two critical Citrix NetScaler ADC and Gateway flaws to its Known Exploited Vulnerabilities KEV catalog, following reports of active exploitation. The vulnerabilities are listed below - CVE-2026-88771 CVSS score: 9.5 - ...

CVE-2026-88778

Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23...

CVE-2026-88772

Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to Remote Code Execution or Denial of Service...

CVE-2026-88773

Inconsistent interpretation of HTTP requests 'HTTP Request/Response smuggling' vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1-37.279 and NDcPP; Gateway: before 14.1-73.37 FIP...

CVE-2026-88776

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable...

CVE-2026-88771

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated...

CVE-2026-88774

Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to a feature policy bypass due to improper HTTP...

CVE-2026-88777

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable...

CVE-2026-88775

Memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading Memory overflow vulnerability...

CVE-2026-88778 TCP Initial Sequence Number (ISN) prediction

Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23...

CVE-2026-88778

Citrix NetScaler ADC and NetScaler Gateway are vulnerable to a TCP Initial Sequence Number (ISN) prediction flaw. The issue affects appliances with TCP-based virtual servers (such as HTTP, SSL, or TCP) where Enhanced ISN Generation is disabled. This vulnerability allows for predictable sequence n...

EUVD-2026-87973

Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23...

CVE-2026-88778 TCP Initial Sequence Number (ISN) prediction

Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23...

CVE-2026-88777 Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable...

CVE-2026-88777 Memory overflow vulnerability leading to unpredictable or erroneous behavior or Denial of Service

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable...

EUVD-2026-87972

Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable...

CVE-2026-88777

A memory overflow vulnerability exists in Citrix NetScaler ADC and Citrix NetScaler Gateway , leading to unpredictable behavior or a Denial of Service (DoS) . The flaw specifically impacts configurations as an LB/CS or CGNAT-LSN/NAT64 device where a non-HTTP Layer 7 protocol (such as FTP , RTSP ,...

CVE-2026-88776

A memory overflow vulnerability exists in Citrix NetScaler ADC and Citrix NetScaler Gateway affecting the Oracle type load balancing virtual server configuration. This flaw can lead to unpredictable or erroneous behavior or a Denial of Service (DoS) . The vulnerability is applicable to the follow...