---
id: CVE-2026-88777
title: >-
  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: befo…
summary: >-
  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: befo…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
vendor: citrix
product: netscaler_application_delivery_controller
affected:
  - 'netscaler_application_delivery_controller >= 13.1, < 13.1-64.23'
  - 'netscaler_application_delivery_controller >= 13.1, < 13.1.37.279'
  - 'netscaler_application_delivery_controller >= 14.1, < 14.1-73.37'
  - 'netscaler_application_delivery_controller >= 14.1-66.68, <= 14.1-73.37'
  - 'netscaler_gateway >= 13.1, < 13.1-64.23'
  - 'netscaler_gateway >= 14.1, < 14.1-73.37'
patched:
  - netscaler_application_delivery_controller 14.1-73.37
  - netscaler_gateway 14.1-73.37
published: '2026-09-27'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T22:19:03.363'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88777'
references:
  - url: >-
      https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778
    label: 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00719
epssPercentile: 0.5368
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-29T15:07:18.195758Z'
scores:
  nvd: 9.8
  cna: 8.8
ingestedAt: '2026-09-27T16:55:23.212Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/CompleTetech-Security/netscaler-cve-2026-88777-check'
  checkedAt: '2026-10-27T19:20:12.455Z'
exploitAvailable: true
---

## Overview

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 or erroneous behavior or Denial of Service

## Affected

- `netscaler_application_delivery_controller >= 13.1, < 13.1-64.23`
- `netscaler_application_delivery_controller >= 13.1, < 13.1.37.279`
- `netscaler_application_delivery_controller >= 14.1, < 14.1-73.37`
- `netscaler_application_delivery_controller >= 14.1-66.68, <= 14.1-73.37`
- `netscaler_gateway >= 13.1, < 13.1-64.23`
- `netscaler_gateway >= 14.1, < 14.1-73.37`

## Remediation

Upgrade past the affected range:

- `netscaler_application_delivery_controller 14.1-73.37`
- `netscaler_gateway 14.1-73.37`