Out-of-bounds Read Vulnerability in UniFi Gateway Devices by Ubiquiti
CVE-2026-77558

7.5HIGH

Key Information:

Vendor

Ubiquiti Inc

Status
Dream Machines
Enterprise Firewalls
Dream Routers
Cloud Gateways
Vendor
CVE Published:
22 September 2026

What is CVE-2026-77558?

A potential vulnerability exists in certain UniFi gateway devices that could allow attackers with network access to perform an Out-of-bounds Read, leading to a Denial of Service (DoS) on the affected devices. This security issue highlights the importance of maintaining network hygiene and monitoring device firmware for vulnerabilities.

Affected Version(s)

Cloud Gateways 0 < 5.1.31

Dream Machines 0 < 5.1.31

Dream Routers 0 < 5.1.31

References

https://community.ui.com/releases/Security-Advisory-Bulle...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.