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High [CVE-2026-21639] airMAX AC: malicious actor in Wi-Fi range of the affected product

This high-severity Ubiquiti advisory covers CVE-2026-21639 affecting airMAX AC, airMAX M, airFiber AF60-XG.

CVE-2026-21639 Published Jan 8, 2026Updated by vendor Jul 30, 2026
Affected products & platforms
UbiquitiUISP / airMAX
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Summary

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 named by the advisory: airMAX AC; airMAX M; airFiber AF60-XG; airFiber AF60.

Affected versions
  • airMAX AC before 8.7.21
  • airMAX M before 6.3.24
  • airFiber AF60-XG before 1.2.3
  • airFiber AF60 before 2.6.8

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 8.7.21
  • 6.3.24
  • 1.2.3
  • 2.6.8

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation

Upgrade to a fixed release: 8.7.21, 6.3.24, 1.2.3, 2.6.8. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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