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CVE-2026-77555

Quick assessment

Affected
Ubiquiti Inc Dream Machines
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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.

CVSS 7.5 · High

Affected Version Matrix 8

VendorProduct Version RangeStatus
Ubiquiti Inc Cloud Gateways < 5.1.31 affected
Ubiquiti Inc Dream Machines < 5.1.31 affected
Ubiquiti Inc Dream Routers < 5.1.31 affected
Ubiquiti Inc Dream Wall < 5.1.31 affected
Ubiquiti Inc Enterprise Firewalls < 5.1.31 affected
Ubiquiti Inc Express < 4.0.21 affected
Ubiquiti Inc Express 7 < 5.1.31 affected
Ubiquiti Inc UniFi Gateways < 5.1.26 affected
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I. Basic Information for CVE-2026-77555

Vulnerability Information

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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc Dream Machines 0 ~ 5.1.31 -
Ubiquiti Inc Enterprise Firewalls 0 ~ 5.1.31 -
Ubiquiti Inc Dream Routers 0 ~ 5.1.31 -
Ubiquiti Inc Cloud Gateways 0 ~ 5.1.31 -
Ubiquiti Inc Dream Wall 0 ~ 5.1.31 -
Ubiquiti Inc Express 0 ~ 4.0.21 -
Ubiquiti Inc Express 7 0 ~ 5.1.31 -
Ubiquiti Inc UniFi Gateways 0 ~ 5.1.26 -

II. Public POCs for CVE-2026-77555

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III. Intelligence Information for CVE-2026-77555

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Other References for CVE-2026-77555 (1)

Same Patch Batch · Ubiquiti Inc · 2026-09-22 · 6 CVEs total

CVE-2026-77556 7.5 HIGH CVE-2026-77556
CVE-2026-77544 7.5 HIGH CVE-2026-77544
CVE-2026-77558 7.5 HIGH CVE-2026-77558
CVE-2026-95862 7.5 HIGH CVE-2026-95862
CVE-2026-95861 7.5 HIGH CVE-2026-95861

IV. Related Vulnerabilities

Same product: Dream Machines
Same vendor: Ubiquiti Inc
Same weakness: CWE-787

V. Comments for CVE-2026-77555

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