CVE-2026-21638
8.8 · HIGHOverview
CVE-2026-21638 is a high-severity vulnerability affecting ui ubb-xg_firmware. It was published on January 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from ui. Update ubb-xg_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| ui | ubb-xg_firmware | >= 0, < 1.2.3 | Affected |
| ui | udb-pro_firmware | >= 0, < 1.4.2 | Affected |
| ui | udb-pro-sector_firmware | >= 0, < 1.4.2 | Affected |
| ui | ubb_firmware | >= 0, < 3.1.7 | Affected |
Frequently Asked Questions
What is CVE-2026-21638?
CVE-2026-21638 is a high-severity vulnerability affecting ui ubb-xg_firmware. It was published on January 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2026-21638?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-21638?
Check the references section for vendor advisories and patches from ui. Update ubb-xg_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-21638?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21638 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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