Vulnerability · Published Aug 26, 2026 · Assigned by Ubiquiti
CVE-2026-77549
Critical 9.0
In plain English
A critical-severity security flaw 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 44% of all known vulnerabilities).
Severity (CVSS 3.1)9.0Critical
Exploit odds (30 days)0.5%top 56.2% 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 and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ubiquiti Inc | UniFi OS Server | 0 – before 5.1.37 |
| Ubiquiti Inc | Cloud Keys | 0 – before 5.1.31 |
| Ubiquiti Inc | Network Video Recorders | 0 – before 5.1.31 |
| Ubiquiti Inc | Enterprise Network Video Recorders | 0 – before 5.1.31 |
| Ubiquiti Inc | Enterprise Network Attached Storage | 0 – before 5.1.31 |
| Ubiquiti Inc | Dream Machines | 0 – before 5.1.31 |
| Ubiquiti Inc | Enterprise Firewall Core | 0 – before 5.1.31 |
| Ubiquiti Inc | Dream Routers | 0 – before 5.1.31 |
| Ubiquiti Inc | Enterprise Fortress Gateway | 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 7 | 0 – before 5.1.31 |
| Ubiquiti Inc | Network Attached Storage | 0 – before 5.1.32 |
| Ubiquiti Inc | Express | 0 – before 4.0.17 |
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H