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Vulnerability record · CVE-2026-21639 · published 8 January 2026

CVE-2026-21639: Ui airmax ac firmware classic buffer overflow vulnerability

Ui · Airmax Ac Firmware

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.

8.8 CVSS 3.1 High EPSS 0.38% · top 70.2% CWE-120 · Classic buffer overflowCWE-77 · Command injection
8.8CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
1References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-21639), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.