CVE-2026-109439 Lantronix XPress-DR - Authentication Bypass

Lantronix XPress-DR and XPress-DR-I firmware through 8.1.0.0 contain a missing authentication vulnerability caused by unauthenticated UDP configuration protocol on port 30718, letting remote attackers read and overwrite device configuration persistently, exploit requires network access to UDP port 30718.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-306

Vendor fix

Update to the latest firmware version or contact vendor for patches; note product reached end-of-life in February 2025.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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