Is CVE-2026-21638 actively exploited?

CVE-2026-21638 has no public evidence of in-the-wild exploitation as of 2026-01-14.

What is the CVSS score for CVE-2026-21638?

CVE-2026-21638 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2026-21638?

Patch guidance is available from ui security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-21638.

Fix CVE-2026-21638 - HIGH ui ubb-xg firmware

Q: Which products are affected by CVE-2026-21638?

4 products: ui ubb-xg firmware, ui udb-pro firmware, ui udb-pro-sector firmware, ui ubb firmware.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: adjacent network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-77 · Command Injection

Metadata

Primary Vendor: UI
Published: 1/8/2026
Last Modified: 1/14/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

ui : ubb-xg_firmwareui : udb-pro_firmwareui : udb-pro-sector_firmwareui : ubb_firmware

Remediation Guidance

Executive Summary

View on NIST NVD