CVE-2026-21638: Command Injection

Published Jan 8, 2026
·
Updated

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 Software

12 affected components
Ubiquiti UBB-XG<1.2.2
Ubiquiti UDB-Pro<1.4.1
Ubiquiti UDB-Pro-Sector<1.4.1
Ubiquiti UBB<3.1.5
All of the following
UI Ubb-xg Firmware<1.2.3
UI Ubb-xg
All of the following
UI Udb-pro Firmware<1.4.2
UI Udb-pro
All of the following
UI Udb-pro-sector Firmware<1.4.2
UI Udb-pro-sector
All of the following
UI Ubb Firmware<3.1.7
UI Ubb

Event History

Jan 8, 2026
CVE Published
via MITRE·04:14 PM
Data Sourced
via MITRE·04:14 PM
DescriptionSeverity
Data Sourced
via NVD·05:15 PM
DescriptionSeverityWeaknessAffected Software
Aug 29, 58046
Event
via FIRST·02:44 AM
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Frequently Asked Questions

1

What is the severity of CVE-2026-21638?

CVE-2026-21638 is considered a high severity vulnerability due to its potential for remote code execution.

2

How do I fix CVE-2026-21638?

To fix CVE-2026-21638, update your Ubiquiti devices to the latest firmware version that addresses this vulnerability.

3

What products are affected by CVE-2026-21638?

CVE-2026-21638 affects Ubiquiti UBB-XG, UDB-Pro, UDB-Pro-Sector, and UBB devices with specific firmware versions.

4

Can CVE-2026-21638 be exploited remotely?

Yes, CVE-2026-21638 can be exploited remotely by an attacker within Wi-Fi range of the affected device.

5

What type of vulnerability is CVE-2026-21638?

CVE-2026-21638 is classified as a remote code execution (RCE) vulnerability in the airMAX Wireless Protocol.

Company

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CVE-2026-21638 - Command Injection - SecAlerts