CVE-2026-21638
Unknown Unknown - Not Provided

Remote Code Execution in Ubiquiti airMAX Wireless Protocol

Publication date: 2026-01-08

Last updated on: 2026-01-08

Assigner: HackerOne

Description
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.

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Meta Information

Published
2026-01-08
Last Modified
2026-01-08
Generated
2026-07-06
AI Q&A
2026-01-08
EPSS Evaluated
2026-07-05
NVD
CVE-2026-21638
EUVD
EUVD-2026-1491

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
ubiquiti ubb-xg to 1.2.2 (exc)
ubiquiti udb-pro to 1.4.1 (exc)
ubiquiti ubb to 3.1.5 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-77 The product 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.

Attack-Flow Graph

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Executive Summary

This vulnerability allows a malicious actor within Wi-Fi range to exploit a flaw in the airMAX Wireless Protocol used by certain Ubiquiti products, enabling them to execute remote code on the affected device without any user interaction or privileges.

Impact Analysis

An attacker exploiting this vulnerability could gain control over the affected device remotely, potentially leading to unauthorized access, disruption of service, data compromise, or further attacks within the network.

Mitigation Strategies

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.

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