Out-of-bounds read in Ubiquiti Dream Machines
Priority LOW 39CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00522 44th percentileScored 2026-11-07
Fix Fixed Dream Machines (Ubiquiti Inc): 5.1.31Enterprise Firewalls (Ubiquiti Inc): 5.1.31+6 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Ubiquiti | Dream Machines | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | Enterprise Firewalls | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | Dream Routers | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | Cloud Gateways | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | Dream Wall | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | Express | before 4.0.21 | 4.0.21 | Patch available | CNA |
| Ubiquiti | Express 7 | before 5.1.31 | 5.1.31 | Patch available | CNA |
| Ubiquiti | UniFi Gateways | before 5.1.26 | 5.1.26 | Patch available | CNA |
- Dream Machines VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- Enterprise Firewalls VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- Dream Routers VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- Cloud Gateways VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- Dream Wall VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- Express VendorUbiquiti Affected before 4.0.21 Fixed in 4.0.21 Patch available CNA
- Express 7 VendorUbiquiti Affected before 5.1.31 Fixed in 5.1.31 Patch available CNA
- UniFi Gateways VendorUbiquiti Affected before 5.1.26 Fixed in 5.1.26 Patch available CNA
Remediation
- Fix · CNA Dream Machines (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA Enterprise Firewalls (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA Dream Routers (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA Cloud Gateways (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA Dream Wall (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA Express (Ubiquiti Inc) Fixed in 4.0.21
- Fix · CNA Express 7 (Ubiquiti Inc) Fixed in 5.1.31
- Fix · CNA UniFi Gateways (Ubiquiti Inc) Fixed in 5.1.26
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Ubiquiti Cloud Gateways, Dream Machines and 6 more products 4.0.21, 5.1.26, 5.1.31
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2026-63715 Out-of-bounds write in Ubiquiti Dream MachinesPriority LOW 39
- TI-2026-63714 Uncontrolled recursion in Ubiquiti Dream MachinesPriority LOW 39
- TI-2026-54078 Out-of-bounds read in Ubiquiti Dream MachinesPriority LOW 39
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77556
- 2026-10-03 Alias added: GHSA-rf8m-f7x4-4m54
References
More Ubiquiti vulnerabilities
- TI-2026-27142 Improper input validation in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2026-27141 Path traversal in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2026-27140 Improper access control in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
- TI-2010-05027 On certain Ubiquiti devices, Command Injection exists via a GET request to stainfo.cgi… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-19187 AirControl 1.4.2 - PreAuth Remote Code Execution CVSS 4.0CRITICAL 9.3
- TI-2015-07644 Ubiquiti airOS HTTP(S) unauthenticated arbitrary file upload CVSS 3.0CRITICAL 9.8
Sources
- CVE-2026-77556 · CVE Program
- CVE-2026-77556 · NVD
- FIRST EPSS
- GHSA-rf8m-f7x4-4m54 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences