Citrix Netscaler Adc And Citrix Netscale

support.citrix.com • October 5, 2026

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

Article ID: CTX697174

NetScaler ADC and NetScaler Gateway is affected by the vulnerability described below CVE-ID Description Pre-conditions CWE CVSSv4 CVE-2026-88779 Memory overflow vulnerability leading to Denial of Service NetScaler ADC or NetScaler Gateway must be configured as a SAML SP OR SAML IdP CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer CVSS v4.0 Base Score: 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N What Customers Should Do Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible: NetScaler ADC and NetScaler Gateway 14.1-73.41 and later releases NetScaler ADC and NetScaler Gateway 13.1-64.28 and later releases of 13.1 NetScaler ADC 14.1-FIPS 14.1-73.41 FIPS and later releases of 14.1-FIPS NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.282 and later releases of 13.1-FIPS and 13.1-NDcPP Steps to determine if an appliance meets the CVE preconditions Instructions : Customers can determine whether their NetScaler deployment meets the precondition by inspecting their NetScaler configuration for entries matching either of the following: Appliance is configured as a SAML SP add authentication samlAction OR Appliance is configured as a SAML IdP add authentication samlIdPProfile Acknowledgement Cloud Software Group thanks Bishop Fox and watchTowr for working with us to protect our customers.

NetScaler ADC and NetScaler Gateway is affected by the vulnerability described below

Memory overflow vulnerability leading to Denial of Service

NetScaler ADC or NetScaler Gateway must be configured as a

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS v4.0 Base Score: 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What Customers Should Do

Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible:

NetScaler ADC and NetScaler Gateway 14.1-73.41 and later releases

NetScaler ADC and NetScaler Gateway 13.1-64.28 and later releases of 13.1

NetScaler ADC 14.1-FIPS 14.1-73.41 FIPS and later releases of 14.1-FIPS

NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.282 and later releases of 13.1-FIPS and 13.1-NDcPP

Steps to determine if an appliance meets the CVE preconditions

Customers can determine whether their NetScaler deployment meets the precondition by inspecting their NetScaler configuration for entries matching either of the following:

Appliance is configured as a SAML SP add authentication samlAction OR

Appliance is configured as a SAML IdP add authentication samlIdPProfile

Cloud Software Group thanks Bishop Fox and watchTowr for working with us to protect our customers.

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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.

The following supported versions of NetScaler are affected by the vulnerability:

Citrix NetScaler ADC and Citrix NetScaler Gateway 14.1 BEFORE 14.1-73.41

Citrix NetScaler ADC and Citrix NetScaler Gateway 13.1 BEFORE 13.1-64.28

Citrix NetScaler ADC FIPS BEFORE 14.1-73.41 FIPS

Citrix NetScaler ADC FIPS and NDcPP BEFORE 13.1-37.282

Additional Note: Secure Private Access Hybrid deployments using NetScaler instances are also affected by the vulnerabilities. Customers need to upgrade these NetScaler instances to the recommended NetScaler builds to address the vulnerabilities. This bulletin only applies to customer-managed Citrix NetScaler ADC (“NetScaler ADC”) and Citrix NetScaler Gateway (“NetScaler Gateway”). Cloud Software Group upgrades the Citrix-managed cloud services and Citrix-managed Adaptive Authentication with the necessary software updates.

Additional Information

Cloud Software Group team has published a related blog at: which contains further context.

Citrix is notifying customers and channel partners this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at

Obtaining Support on This Issue

If you require technical assistance with this issue, please Citrix Technical Support. details for Citrix Technical Support are available at

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage:

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Citrix NetScaler Zero-Day Vulnerabilities Exploited In late September 2026, two critical zero-day vulnerabilities (CVE-2026-88771 and CVE-2026-88772) in Citrix NetScaler ADC and Gateway were actively exploited, allowing remote code execution. The Cybersecurity and Infrastructure Security Agency (CISA) added these CVEs to its Known Exploited Vulnerabilities catalog on September 27, 2026, with a CVSS score of 9.5. Attackers utilized custom web shells named WHIPSHOT and SLAPSHOT to gain unauthorized access to affected systems. Organizations in sectors such as government, finance, and healthcare were particularly vulnerable. Citrix has since released patches for these vulnerabilities, but the urgency of the situation has raised concerns about the effectiveness of their response. The incidents highlight the ongoing risks associated with internet-exposed edge devices and the need for rapid incident response. As of October 4, 2026, the exploitation is confirmed to be ongoing, with significant operational and compliance risks reported. 78 sources 80

Extracted Entities

Citrix Netscaler Adc And Citrix Netscale

The full story

Extracted Entities

Attack Types (1)

CVEs (1)

CWE Weaknesses (1)

Domains (1)

Platforms (2)