Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck
CVE-2026-109439Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
Critical 9.8
In plain English
A critical-severity missing authentication in XPress-DR from LANTRONIX. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| LANTRONIX | XPress-DR | 0 – through 8.1.0.0 |
| LANTRONIX | XPress-DR-I | 0 – through 8.1.0.0 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- End-of-Life Announcement vendor-advisory
- VulnCheck Advisory: Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718 third-party-advisory