PT-2026-2074 · Ubiquiti Networks · Airfiber Af60+3

Published 2026-01-08 · Updated 2026-05-19 · CVE-2026-21639

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions airMAX AC versions 8.7.20 and earlier airMAX M versions 6.3.22 and earlier airFiber AF60-XG version 1.2.2 and earlier airFiber AF60 versions 2.6.7 and earlier

Description A malicious actor within Wi-Fi range could exploit a flaw in the airMAX Wireless Protocol to execute code remotely on affected devices.

Recommendations Update airMAX AC to version 8.7.21 or later. Update airMAX M to version 6.3.24 or later. Update airFiber AF60-XG to version 1.2.3 or later. Update airFiber AF60 to version 2.6.8 or later.

Fix

RCE

Command Injection

Weakness Enumeration

CWE-77

Related Identifiers

CVE-2026-21639

Affected Products

Airfiber Af60

Airfiber Af60-Xg

Airmax Ac

Airmax

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-21639 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21639 · Vendor Advisory
• https://community.ui.com/releases/Security-Advisory-Bulletin-061-061/1e4fe5f8-29c7-4a7d-a518-01b1537983ba · Vendor Advisory
• https://twitter.com/router_bugs/status/2056781769886794021 · Twitter Post
• https://twitter.com/CVEnew/status/2009462362936627429 · Twitter Post