CVE-2026-21639

State: Published
Severity: 8.8 High
Published: Jan 8, 2026
Updated: Jul 30, 2026
Reserved: Jan 1, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	hackerone
3.1	5.4 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-120 Classic Buffer Overflow
CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')

Affected Products

Product	Versions
airMAX ACUbiquiti Inc	before 8.7.21Affected
airMAX MUbiquiti Inc	before 6.3.24Affected
airFiber AF60-XGUbiquiti Inc	before 1.2.3Affected
airFiber AF60Ubiquiti Inc	before 2.6.8Affected

References

https://community.ui.com/releases/Security-Advisory-Bulletin-061-061/1e4fe5f8-29c7-4a7d-a518-01b1537983ba

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