What’s Vulnerable › Vulnerabilities
CVE-2026-77550
- Severity: critical (CVSS 10.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-26 · updated 2026-08-28
- Weakness: CWE-93
Description
A malicious actor with access to the network 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
- Ubiquiti Inc Cloud Gateways: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Cloud Keys: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Dream Machines: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Dream Routers: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Dream Wall: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Enterprise Firewall Core: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Enterprise Fortress Gateway: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Enterprise Network Attached Storage: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Enterprise Network Video Recorders: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Express: before 4.0.17 — fixed in 4.0.17
- Ubiquiti Inc Express 7: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc Network Attached Storage: before 5.1.32 — fixed in 5.1.32
- Ubiquiti Inc Network Video Recorders: before 5.1.31 — fixed in 5.1.31
- Ubiquiti Inc UniFi OS Server: before 5.1.37 — fixed in 5.1.37
How to fix
Upgrade to a fixed version: Ubiquiti Inc Cloud Gateways 5.1.31; Ubiquiti Inc Cloud Keys 5.1.31; Ubiquiti Inc Dream Machines 5.1.31; Ubiquiti Inc Dream Routers 5.1.31; Ubiquiti Inc Dream Wall 5.1.31; Ubiquiti Inc Enterprise Firewall Core 5.1.31; Ubiquiti Inc Enterprise Fortress Gateway 5.1.31; Ubiquiti Inc Enterprise Network Attached Storage 5.1.31; Ubiquiti Inc Enterprise Network Video Recorders 5.1.31; Ubiquiti Inc Express 4.0.17; Ubiquiti Inc Express 7 5.1.31; Ubiquiti Inc Network Attached Storage 5.1.32. Check the vendor advisory for mitigations.
References
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