What is the CVSS score of CVE-2026-21639?

CVE-2026-21639 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of Airmax Ac Firmware are affected by CVE-2026-21639?

CVE-2026-21639 presents moderate security risk, a command injection vulnerability rated CVSS 5.4. Exploitation could allow attackers to execute code or inject malicious input.

How to fix or mitigate CVE-2026-21639?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.

Airmax Ac Firmware CVE-2026-21639

MEDIUM

Command Injection (CWE-77)

2026-01-08 support@hackerone.com

RCE Airmax Ac Firmware Airfiber Af60 Firmware Airfiber Af60 Xg Firmware Airmax M Firmware

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 08, 2026 - 17:15 nvd

MEDIUM 5.4

DescriptionCVE.org

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.

AnalysisAI

Remote code execution in Ubiquiti airMAX and airFiber wireless products allows adjacent attackers to execute arbitrary code on affected devices via a flaw in the airMAX Wireless Protocol without requiring authentication. Vulnerable versions include airMAX AC 8.7.20 and earlier, airMAX M 6.3.22 and earlier, airFiber AF60-XG 1.2.2 and earlier, and airFiber AF60 2.6.7 and earlier. Patches are available for all affected products.

Technical ContextAI

Classified as CWE-77 (Command Injection). Affects 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.

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