---
id: "CVE-2026-120861"
page: "https://infrastack.ai/live/CVE-2026-120861"
kind: "vulnerability"
aliases: ["CVE-2026-120861"]
title: "Citrix NetScaler ADC/Gateway: memory overflow in GSLB and geolocation can cause denial of service"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"name": "NetScaler ADC and Gateway 14.1", "fixed": ["14.1-73.57"], "affected": "< 14.1-73.57", "ecosystem": "vendor"}, {"name": "NetScaler ADC and Gateway 13.1", "fixed": ["13.1-64.39"], "affected": "< 13.1-64.39", "ecosystem": "vendor"}, {"name": "NetScaler ADC 14.1-FIPS", "fixed": ["14.1-73.58"], "affected": "< 14.1-73.58", "ecosystem": "vendor"}, {"name": "NetScaler ADC 13.1-FIPS and NDcPP", "fixed": ["13.1-37.293"], "affected": "< 13.1-37.293", "ecosystem": "vendor"}]
ecosystems: []
tags: ["citrix-netscaler", "gslb", "load-balancing", "self-hosted", "vendor"]
not_affected_if: ["citrix-managed-cloud", "no-gslb"]
published_at: "2026-11-13T08:17:16+00:00"
first_seen_at: "2026-11-13T08:44:24+00:00"
updated_at: "2026-11-13T08:46:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120861", "first_seen_at": "2026-11-13T08:44:24+00:00"}, {"source": "analyst", "url": "https://support.citrix.com/external/article/CTX697305", "first_seen_at": "2026-11-13T08:46:13+00:00", "cites": ["https://support.citrix.com/external/article/CTX697305"]}]
exploit_sources: []
---

# Citrix NetScaler ADC/Gateway: memory overflow in GSLB and geolocation can cause denial of service

Link for people: https://infrastack.ai/live/CVE-2026-120861 (this .md is for agents)

A memory overflow in NetScaler's GSLB and geolocation features (MEP, static-proximity, config-sync) can cause unpredictable or erroneous behavior. The flaw can also be used to cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:NetScaler ADC and Gateway 14.1 affected < 14.1-73.57 fixed 14.1-73.57
- vendor:NetScaler ADC and Gateway 13.1 affected < 13.1-64.39 fixed 13.1-64.39
- vendor:NetScaler ADC 14.1-FIPS affected < 14.1-73.58 fixed 14.1-73.58
- vendor:NetScaler ADC 13.1-FIPS and NDcPP affected < 13.1-37.293 fixed 13.1-37.293

## How to check

Only appliances with GSLB or geolocation configured are in scope. Search the NetScaler config for: 'add gslb site ... -metricExchange ENABLED', 'set gslb parameter -automaticConfigSync ENABLED', 'add gslb vserver <name> <type> -lbmethod STATICPROXIMITY', or a responder policy using CLIENT.IP.SRC.MATCHES_LOCATION(...). If none match, this CVE's precondition is not met. Then compare the build to the fixed versions.

## Fix

Upgrade to 14.1-73.57 or later (14.1), 13.1-64.39 or later (13.1), 14.1-73.58 FIPS or later (14.1-FIPS), 13.1-37.293 or later (13.1-FIPS and 13.1-NDcPP). Citrix lists no workaround.

## Timeline

- 2026-11-13T08:44:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120861
- 2026-11-13T08:46:13+00:00 analyst https://support.citrix.com/external/article/CTX697305 — Read Citrix bulletin CTX697305: preconditions, affected/fixed builds, no workaround listed. X/community not searched; no exploitation or PoC stated.

## Documents

- [advisory] Citrix NetScaler ADC and Gateway Security Bulletin CTX697305 https://support.citrix.com/external/article/CTX697305

## From the sources

Memory overflow / improper handling in GSLB and geolocation (MEP, static-proximity, config-sync) can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_