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Fencer Intel
critical 9.0

CVE-2026-77549 json

A malicious actor with access to the network and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulner…

published 2mo ago modified 2mo ago also EUVD-2026-66398

cvss
9.0
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 and under certain conditions 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.

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
  • Ubiquiti Inc Express 4.0.17

Is CVE-2026-77549 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 44% 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:H/PR:N/UI:N/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
  • Ubiquiti Inc Express

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

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.