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01 Record

CVE-2026-77549

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

CriticalPUBLISHEDCNA: Ubiquiti
CNA base score9.0 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.51% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 43.3% of scored records. A rank, not a probability.
NVD base score
9.0 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD analysis status
Deferred. NVD last modified this record on 2026-08-28.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-08-26 10:30Z2 MO AGO
Last updated
2026-08-27 03:56Z2 MO AGO
Reserved
2026-08-20
Assigning CNA
Ubiquiti
Record state
PUBLISHED
Severity
Critical (CVSS 9.0)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Weaknesses
  • CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')Base
Data version
5.2
Document digest
2457774cf8d3d68cd3cbaabba6cfd312b24aa3c52067573bff4134715fe3b4f4

05 Affected products

VendorProductVersionsPlatforms
Ubiquiti IncUniFi OS Server0 to < 5.1.37—
Ubiquiti IncCloud Keys0 to < 5.1.31—
Ubiquiti IncNetwork Video Recorders0 to < 5.1.31—
Ubiquiti IncEnterprise Network Video Recorders0 to < 5.1.31—
Ubiquiti IncEnterprise Network Attached Storage0 to < 5.1.31—
Ubiquiti IncDream Machines0 to < 5.1.31—
Ubiquiti IncEnterprise Firewall Core0 to < 5.1.31—
Ubiquiti IncDream Routers0 to < 5.1.31—
Ubiquiti IncEnterprise Fortress Gateway0 to < 5.1.31—
Ubiquiti IncCloud Gateways0 to < 5.1.31—
Ubiquiti IncDream Wall0 to < 5.1.31—
Ubiquiti IncExpress 70 to < 5.1.31—
Ubiquiti IncNetwork Attached Storage0 to < 5.1.32—
Ubiquiti IncExpress0 to < 4.0.17—

06 References