CVE-2026-21638: UI Ubb-XG Firmware

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• UI Ubb-XG Firmware: before 1.2.3 (fixed in 1.2.3)
• UI Ubb Firmware: before 3.1.7 (fixed in 3.1.7)
• UI Udb-Pro-Sector Firmware: before 1.4.2 (fixed in 1.4.2)
• UI Udb-Pro Firmware: before 1.4.2 (fixed in 1.4.2)

Published 2026-01-08. Last modified 2026-06-17.