Vulnerability · Published Sep 22, 2026 · Assigned by Ubiquiti
CVE-2026-77556
High 7.5
In plain English
A high-severity out-of-bounds read in Cloud Gateways from Ubiquiti Inc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 55.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ubiquiti Inc | Dream Machines | 0 – before 5.1.31 |
| Ubiquiti Inc | Enterprise Firewalls | 0 – before 5.1.31 |
| Ubiquiti Inc | Dream Routers | 0 – before 5.1.31 |
| Ubiquiti Inc | Cloud Gateways | 0 – before 5.1.31 |
| Ubiquiti Inc | Dream Wall | 0 – before 5.1.31 |
| Ubiquiti Inc | Express | 0 – before 4.0.21 |
| Ubiquiti Inc | Express 7 | 0 – before 5.1.31 |
| Ubiquiti Inc | UniFi Gateways | 0 – before 5.1.26 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H