Detections
Analytics
Ubiquiti UniFi OS Server < 5.1.37 Multiple Vulnerabilities
critical Nessus Plugin ID 344795
Synopsis
An application installed on the remote host is affected by multiple vulnerabilities.Description
The version of Ubiquiti UniFi OS Server installed on the remote host is prior to 5.1.37. It is, therefore, affected by multiple vulnerabilities:- 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.
(CVE-2026-77549)
- A malicious actor with access to the network 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. (CVE-2026-77550)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade Ubiquiti UniFi OS Server to version 5.1.37 or later.See Also
Plugin Details
Severity: Critical
ID: 344795
File Name: ubnt_unifi_os_server_5_1_37.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Misc.
Published: 9/11/2026
Updated: 9/11/2026
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5
Percentile: 93.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-77550
CVSS v3
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: x-cpe:/a:ui:unifi_os_server
Required KB Items: installed_sw/Ubiquiti UniFi OS Server
Patch Publication Date: 8/26/2026
Vulnerability Publication Date: 8/26/2026
Reference Information
CVE: CVE-2026-77549, CVE-2026-77550
IAVA: 2026-A-0978