CVE-2026-77558 UniFi Gateway - Denial of Service

UniFi gateway devices contain an out-of-bounds read vulnerability that allows a network attacker to cause denial of service by crashing the device, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.52% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to the latest version of UniFi gateway devices.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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