High [CVE-2026-77555] Dream Machines: malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device
This high-severity Ubiquiti advisory covers CVE-2026-77555 affecting UniFi Gateways.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.
Affected product named by the advisory: UniFi Gateways.
- Dream Machines before 5.1.31
- Enterprise Firewalls before 5.1.31
- Dream Routers before 5.1.31
- Cloud Gateways before 5.1.31
- Dream Wall before 5.1.31
- Express before 4.0.21
- Express 7 before 5.1.31
- UniFi Gateways before 5.1.26
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
- 5.1.31
- 4.0.21
- 5.1.26
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation
Upgrade to a fixed release: 5.1.31, 4.0.21, 5.1.26. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Discussion(0)
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