CVE-2026-77556: High severity Ubiquiti UniFi gateway devices vulnerability
Published Sep 22, 2026
·Updated
A malicious actor with access to the network could exploit an Out-of-bounds Read vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.
Affected Software
1 affected component
Ubiquiti UniFi gateway devices
Event History
Sep 22, 2026
CVE Published
via MITRE·06:41 PM
Data Sourced
via MITRE·06:41 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Who can exploit this issue?
Any malicious actor with network access to an affected UniFi gateway device could exploit it. No privileges or user interaction are required according to the supplied severity vector.
2
What is the expected impact of successful exploitation?
Successful exploitation can cause a denial of service on the affected gateway device. The supplied vector indicates availability impact only, with no stated confidentiality or integrity impact.
3
Are UniFi gateway devices affected by default?
The available information identifies certain UniFi gateway devices as affected, but does not state which models, firmware versions, or configurations are vulnerable.