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CVE-2026-109439

9.8, critical

LANTRONIX XPress-DR Missing Authentication for Critical Function Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
0.6% higher than 48.5% of scored CVEs
Exploitation
No public evidence
Published
14 Oct 20263 days ago

Description

Lantronix XPress-DR and XPress-DR-I (CoBos-family) firmware through 8.1.0.0 contains a missing authentication vulnerability that allows remote attackers to read and persistently overwrite device configuration by sending crafted frames to the unauthenticated UDP configuration protocol on port 30718. Attackers can send a type 0xF8 query to read live configuration data and a type 0xFD frame with exactly 0x78 body bytes to rewrite the device IP address and serial-channel forwarding records, causing changes to commit to EEPROM and persist across reboots. The XPress-DR product series reached end-of-life/end-of-support in February 2025.

Details

Vendor
LANTRONIX
Product
XPress-DR
Weakness
CWE-306 (opens in a new tab)
Status
Received
Updated
14 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 2

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other LANTRONIX CVEs

Every LANTRONIX CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-67038 Lantronix EDS5000 Code Injection Vulnerability KEV EPSS 20% 9.8, critical

Beyond this page

Is CVE-2026-109439 in your network?

This page tells you how dangerous CVE-2026-109439 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.