CVE-2026-77555: 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 Write 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·06:38 PM
Data Sourced
via MITRE·06:38 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Who can exploit this issue?
An attacker with network access to an affected UniFi gateway device can exploit it. No privileges or user interaction are required.
2
What is the expected impact of a successful attack?
Successful exploitation can cause a denial of service on the affected device. The provided data does not indicate confidentiality or integrity impact.
3
Are specific affected gateway models or fixed versions identified?
No affected model list or fixed version is provided in the available data. Consult the referenced Ubiquiti security advisory to identify whether a particular gateway is affected and available remediation.