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Fencer Intel
critical 9.0

CVE-2026-77545 json

A malicious actor with access to the network, low privileges and under certain conditions could exploit an Active Debug Code vulnerability…

published 2mo ago modified 2mo ago also EUVD-2026-66390

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

A malicious actor with access to the network, low privileges and under certain conditions could exploit an Active Debug Code vulnerability found in certain devices running UniFi OS to escalate privileges within such UniFi OS devices or instances.

Patch / fix

  • Ubiquiti Inc UniFi OS Server 5.1.37
  • Ubiquiti Inc Cloud Keys 5.1.31
  • Ubiquiti Inc Network Video Recorders 5.1.31
  • Ubiquiti Inc Enterprise Network Video Recorders 5.1.31
  • Ubiquiti Inc Enterprise Network Attached Storage 5.1.31
  • Ubiquiti Inc Dream Machines 5.1.31
  • Ubiquiti Inc Enterprise Firewall Core 5.1.31
  • Ubiquiti Inc Dream Routers 5.1.31
  • Ubiquiti Inc Enterprise Fortress Gateway 5.1.31
  • Ubiquiti Inc Cloud Gateways 5.1.31
  • Ubiquiti Inc Dream Wall 5.1.31
  • Ubiquiti Inc Express 7 5.1.31
  • Ubiquiti Inc Network Attached Storage 5.1.32

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

  • Ubiquiti Inc UniFi OS Server
  • Ubiquiti Inc Cloud Keys
  • Ubiquiti Inc Network Video Recorders
  • Ubiquiti Inc Enterprise Network Video Recorders
  • Ubiquiti Inc Enterprise Network Attached Storage
  • Ubiquiti Inc Dream Machines
  • Ubiquiti Inc Enterprise Firewall Core
  • Ubiquiti Inc Dream Routers
  • Ubiquiti Inc Enterprise Fortress Gateway
  • Ubiquiti Inc Cloud Gateways
  • Ubiquiti Inc Dream Wall
  • Ubiquiti Inc Express 7
  • Ubiquiti Inc Network Attached Storage

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.