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CVE-2026-21639

Published: Jan 8, 2026Updated: Jan 14, 2026 Sources: CVE List NVDCWE-77
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.3%
Top 81.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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: airMAX AC (Version 8.7.20 and earlier) airMAX M (Version 6.3.22 and earlier) airFiber AF60-XG (Version 1.2.2 and earlier) airFiber AF60 (Version 2.6.7 and earlier) Mitigation: Update your airMAX AC to Version 8.7.21 or later. Update your airMAX M to Version 6.3.24 or later. Update your airFiber AF60-XG to Version 1.2.3 or later. Update your airFiber AF60 to Version 2.6.8 or later.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-77

Affected Products

airMAX ACUbiquiti IncNetworking Infrastructure
airMAX MUbiquiti IncNetworking Infrastructure
airFiber AF60-XGUbiquiti IncNetworking Infrastructure
airFiber AF60Ubiquiti IncNetworking Infrastructure
airmax ac firmwareuiNetworking Infrastructure
ubiquiti inccommercialUSNetworking Infrastructure
uicommercialNetworking Infrastructureaka ui
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

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

Timeline

Published
Jan 8, 2026
Last Updated
Jan 14, 2026

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