Review reviewHigh

CVE-2026-21639

Ubiquiti Inc airMAX AC, airMAX M, airFiber AF60-XG

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
8.8
EPSS
0.35%
27.5% percentile
CISA KEV
Not listed
Published
2026.01.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.35%
Technical severityCVSS 8.8

Vulnerability overview

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 product and versions

Product
Ubiquiti Inc airMAX AC, airMAX M, airFiber AF60-XG
Affected versions
< 8.7.21, < 6.3.24, < 1.2.3, < 2.6.8
Fixed versions
8.7.21, 6.3.24, 1.2.3, 2.6.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Ubiquiti Inc airMAX AC, airMAX M, airFiber AF60-XG and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-120, CWE-77