Critical severity · published Aug 26, 2026
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…
9.0
CVSS
0.5%
EPSS
No
On KEV
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 authentication to such UniFi OS devices or instances.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CG
Cloud Gateways · Ubiquiti Inc
before 5.1.31 · source: vendor
CK
Cloud Keys · Ubiquiti Inc
before 5.1.31 · source: vendor
DM
Dream Machines · Ubiquiti Inc
before 5.1.31 · source: vendor
DR
Dream Routers · Ubiquiti Inc
before 5.1.31 · source: vendor
DW
Dream Wall · Ubiquiti Inc
before 5.1.31 · source: vendor
EF
Enterprise Firewall Core · Ubiquiti Inc
before 5.1.31 · source: vendor
EF
Enterprise Fortress Gateway · Ubiquiti Inc
before 5.1.31 · source: vendor
EN
Enterprise Network Attached Storage · Ubiquiti Inc
before 5.1.31 · source: vendor
EN
Enterprise Network Video Recorders · Ubiquiti Inc
before 5.1.31 · source: vendor
EX
Express · Ubiquiti Inc
before 4.0.17 · source: vendor
E7
Express 7 · Ubiquiti Inc
before 5.1.31 · source: vendor
NA
Network Attached Storage · Ubiquiti Inc
before 5.1.32 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77549
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77549
community.ui.com
https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9
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