CVE-2026-77558 json
A malicious actor with access to the network could exploit an Out-of-bounds Read vulnerability found in certain UniFi gateway devices to ex…
published 2026-09-22 47 d ago modified 2026-09-22 47 d ago also EUVD-2026-84756
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
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.
Patch / fix
- Ubiquiti Inc Dream Machines 5.1.31
- Ubiquiti Inc Enterprise Firewalls 5.1.31
- Ubiquiti Inc Dream Routers 5.1.31
- Ubiquiti Inc Cloud Gateways 5.1.31
- Ubiquiti Inc Dream Wall 5.1.31
- Ubiquiti Inc Express 4.0.21
- Ubiquiti Inc Express 7 5.1.31
- Ubiquiti Inc UniFi Gateways 5.1.26
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 47 d ago
Exploit prediction
0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- Ubiquiti Inc Dream Machines
- Ubiquiti Inc Enterprise Firewalls
- Ubiquiti Inc Dream Routers
- Ubiquiti Inc Cloud Gateways
- Ubiquiti Inc Dream Wall
- Ubiquiti Inc Express
- Ubiquiti Inc Express 7
- Ubiquiti Inc UniFi Gateways
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
Sources
- CVE List CVE-2026-77558
- NVD CVE-2026-77558
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