CVE-2026-21638

EUVD-2026-1491

08.01.2026, 17:15

A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.


Affected Products:
UBB-XG (Version 1.2.2 and earlier) 
UDB-Pro/UDB-Pro-Sector  (Version 1.4.1 and earlier) 
UBB  (Version 3.1.5 and earlier) 
 
Mitigation:
Update your UBB-XG to Version 1.2.3 or later.
Update your UDB-Pro/UDB-Pro-Sector  to Version 1.4.2 or later.
Update your UBB to Version 3.1.7 or later.

Command Injection

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	8.8 HIGH	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
hackerone	CNA	8.8 HIGH				CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 41%

Affected Products (NVD)

Vendor	Product	Version
ui	ubb-xg_firmware	𝑥 < 1.2.3
ui	udb-pro_firmware	𝑥 < 1.4.2
ui	udb-pro-sector_firmware	𝑥 < 1.4.2
ui	ubb_firmware	𝑥 < 3.1.7

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
The software constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

References

https://community.ui.com/releases/Security-Advisory-Bulletin-060-060/cde18da7-2bc4-41bb-a9cc-48a4a4c479c1