---
id: "CVE-2026-120860"
page: "https://infrastack.ai/live/CVE-2026-120860"
kind: "vulnerability"
aliases: ["CVE-2026-120860"]
title: "Citrix NetScaler: memory overflow in protocol load balancing causes denial of service"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "NetScaler ADC / Gateway 14.1", "fixed": ["14.1-73.57"], "affected": "< 14.1-73.57", "ecosystem": "vendor"}, {"name": "NetScaler ADC / 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 / 13.1-NDcPP", "fixed": ["13.1-37.293"], "affected": "< 13.1-37.293", "ecosystem": "vendor"}]
ecosystems: []
tags: ["citrix", "diameter", "infrastructure", "load-balancing", "mqtt", "netscaler", "radius", "self-hosted", "sip"]
not_affected_if: ["managed-hosting", "no-diameter-sip_tcp-mqtt-radius-lb-vserver", "no-netscaler", "protocol-lb-not-used"]
published_at: "2026-11-13T08:17:16+00:00"
first_seen_at: "2026-11-13T08:44:24+00:00"
updated_at: "2026-11-13T08:47:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120860", "first_seen_at": "2026-11-13T08:44:24+00:00"}, {"source": "analyst", "url": "https://support.citrix.com/external/article/CTX697305", "first_seen_at": "2026-11-13T08:47:15+00:00", "cites": ["https://support.citrix.com/external/article/CTX697305"]}]
exploit_sources: []
---

# Citrix NetScaler: memory overflow in protocol load balancing causes denial of service

Link for people: https://infrastack.ai/live/CVE-2026-120860 (this .md is for agents)

A memory overflow in how NetScaler ADC and NetScaler Gateway handle load-balanced Diameter, SIP-over-TCP, MQTT and RADIUS traffic can cause erratic behavior or a denial of service. The sources describe the impact as unpredictable behavior or denial of service rather than code execution.

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

## Affected

- vendor:NetScaler ADC / Gateway 14.1 affected < 14.1-73.57 fixed 14.1-73.57
- vendor:NetScaler ADC / 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 / 13.1-NDcPP affected < 13.1-37.293 fixed 13.1-37.293

## How to check

In the ns.conf / running config, look for load balancing vservers of type DIAMETER, SIP_TCP, MQTT or RADIUS: 'add lb vserver <name> DIAMETER|SIP_TCP|MQTT|RADIUS <IP> <Port>' (e.g. 'show running config | grep -E "add lb vserver .* (DIAMETER|SIP_TCP|MQTT|RADIUS) "'). If none exist, the precondition is not met. Then compare 'show version' with the fixed builds.

## Fix

Upgrade to NetScaler ADC/Gateway 14.1-73.57 or later, 13.1-64.39 or later 13.1, 14.1-FIPS 14.1-73.58 or later, 13.1-FIPS/13.1-NDcPP 13.1-37.293 or later.

## Timeline

- 2026-11-13T08:44:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120860
- 2026-11-13T08:47:15+00:00 analyst https://support.citrix.com/external/article/CTX697305 — Read Citrix bulletin CTX697305: precondition, affected/fixed builds. No mitigations listed. No exploitation or PoC stated in bulletin; X/posts not searched.

## Documents

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

## From the sources

Memory overflow in protocol load-balancing traffic handling (Diameter, SIP-over-TCP, MQTT, RADIUS) can lead to unpredictable or erroneous behavior or Denial of Service in Citrix NetScaler ADC and Citrix NetScaler Gateway.

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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_