Denial of Service in NetScaler ADC and Gateway via HTTP/2

Publication date: 2026-06-30

Last updated on: 2026-07-02

Assigner: 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5

Description

Denial of service via malformed HTTP/2 requests in NetScaler ADC and NetScaler Gateway if HTTP/2 is enabled in HTTP Profile and associated with the virtual server (of type LB, CS, VPN) or the service configured on NetScaler

CVSS Scores

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Meta Information

Published

2026-06-30

Last Modified

2026-07-02

Generated

2026-07-20

AI Q&A

2026-06-30

EPSS Evaluated

2026-07-19

NVD

CVE-2026-13474

EUVD

EUVD-2026-40320

Affected Vendors & Products

Vendor	Product	Version / Range
citrix	netscaler_application_delivery_controller	From 13.1 (inc) to 13.1-63.18 (exc)
citrix	netscaler_application_delivery_controller	From 14.1 (inc) to 14.1-72.61 (exc)
citrix	netscaler_application_delivery_controller	to 13.1-37.272 (exc)
citrix	netscaler_application_delivery_controller	to 13.1-37.272 (exc)
citrix	netscaler_application_delivery_controller	14.1-66.68
citrix	netscaler_gateway	From 13.1 (inc) to 13.1-63.18 (exc)
citrix	netscaler_gateway	From 14.1 (inc) to 14.1-72.61 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-401	The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Attack-Flow Graph

Executive Summary

This vulnerability is a denial of service (DoS) issue that occurs when malformed HTTP/2 requests are sent to NetScaler ADC and NetScaler Gateway devices. It specifically affects these devices if HTTP/2 is enabled in the HTTP Profile and associated with the virtual server (such as load balancing, content switching, or VPN) or the service configured on NetScaler.

Impact Analysis

The impact of this vulnerability is a denial of service condition, which means that an attacker can send specially crafted malformed HTTP/2 requests to disrupt the normal operation of NetScaler ADC or NetScaler Gateway devices. This can cause the affected services or virtual servers to become unavailable, potentially leading to downtime or loss of access to critical network functions.

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