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CVE-2026-21638

Quick assessment

Affected
Ubiquiti Inc UBB-XG
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 UBB-XG和Ubiquiti UDB-Pro都是美国优比快（Ubiquiti）公司的一款无线网桥设备。 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：UBB-XG 1.2.2及之前版本、UDB-Pro/UDB-Pro-Sector 1.4.1及之前版本和UBB 3.1.5及之前版本。

CVSS 8.8 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-21638

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. Affected Products: UBB-XG (Version 1.2.2 and earlier) UDB-Pro/UDB-Pro-Sector (Version 1.4.1 and earlier) UBB (Version 3.1.5 and earlier) Mitigation: Update your UBB-XG to Version 1.2.3 or later. Update your UDB-Pro/UDB-Pro-Sector to Version 1.4.2 or later. Update your UBB to Version 3.1.7 or later.
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
N/A
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 UBB-XG和Ubiquiti UDB-Pro都是美国优比快（Ubiquiti）公司的一款无线网桥设备。 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：UBB-XG 1.2.2及之前版本、UDB-Pro/UDB-Pro-Sector 1.4.1及之前版本和UBB 3.1.5及之前版本。
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 UBB-XG 0 ~ 1.2.3 -
Ubiquiti Inc UDB-Pro/UDB-Pro-Sector 0 ~ 1.4.2 -
Ubiquiti Inc UBB 0 ~ 3.1.7 -

II. Public POCs for CVE-2026-21638

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III. Intelligence Information for CVE-2026-21638

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Vendor Advisories for CVE-2026-21638 (1)

IV. Related Vulnerabilities

Same vendor: Ubiquiti Inc

V. Comments for CVE-2026-21638

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