---
id: CVE-2026-77544
title: >-
  A malicious actor with access to the network could exploit an Out-of-bounds
  Write vulnerability found in certain UniFi gateway devices to execute a Denial
  of Service (DoS) attack on the device.
summary: >-
  A malicious actor with access to the network could exploit an Out-of-bounds
  Write vulnerability found in certain UniFi gateway devices to execute a Denial
  of Service (DoS) attack on the device.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-787
vendor: Ubiquiti Inc
product: Dream Machines
affected:
  - dream_machines < 5.1.31
  - enterprise_firewalls < 5.1.31
  - dream_routers < 5.1.31
  - cloud_gateways < 5.1.31
  - dream_wall < 5.1.31
  - Express < 4.0.21
  - express_7 < 5.1.31
  - unifi_gateways < 5.1.26
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:17:08.350'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77544'
references:
  - url: >-
      https://community.ui.com/releases/Security-Advisory-Bulletin-069-069/07e367a7-edec-4d85-a058-f97e5ce9ac9c
    label: fe490ce8-0395-4072-90d8-2707e1bdf984
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-22T19:32:07.314862Z'
ingestedAt: '2026-09-22T19:09:10.008Z'
epss: 0.0046
epssPercentile: 0.3918
---

## Overview

A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.