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CVE-2026-21639

Quick assessment

Affected
Ubiquiti Inc airMAX AC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ubiquiti airFiber等都是美国优比快（Ubiquiti）公司的产品。Ubiquiti airFiber是一款点对点无线平台。Ubiquiti airMAX AC是一个室外无线宽带设备。Ubiquiti airMAX airFiber AF60-XG是一个室外无线宽带设备。 Ubiquiti多款产品存在安全漏洞，该漏洞源于airMAX无线协议存在问题，可能导致远程代码执行。以下产品和版本受到影响：airMAX AC 8.7.20及之前版本、airMAX M 6.3.22及之前版本、airFib

CVSS 8.8 · High EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
Ubiquiti Inc airFiber AF60 < 2.6.8 affected
Ubiquiti Inc airFiber AF60-XG < 1.2.3 affected
Ubiquiti Inc airMAX AC < 8.7.21 affected
Ubiquiti Inc airMAX M < 6.3.24 affected
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I. Basic Information for CVE-2026-21639

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Ubiquiti多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ubiquiti airFiber等都是美国优比快（Ubiquiti）公司的产品。Ubiquiti airFiber是一款点对点无线平台。Ubiquiti airMAX AC是一个室外无线宽带设备。Ubiquiti airMAX airFiber AF60-XG是一个室外无线宽带设备。 Ubiquiti多款产品存在安全漏洞，该漏洞源于airMAX无线协议存在问题，可能导致远程代码执行。以下产品和版本受到影响：airMAX AC 8.7.20及之前版本、airMAX M 6.3.22及之前版本、airFib
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc airMAX AC 0 ~ 8.7.21 -
Ubiquiti Inc airMAX M 0 ~ 6.3.24 -
Ubiquiti Inc airFiber AF60-XG 0 ~ 1.2.3 -
Ubiquiti Inc airFiber AF60 0 ~ 2.6.8 -

II. Public POCs for CVE-2026-21639

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-21639

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Vendor Advisories for CVE-2026-21639 (1)

IV. Related Vulnerabilities

Same vendor: Ubiquiti Inc
Same weakness: CWE-120

V. Comments for CVE-2026-21639

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