CVE-2026-109439
Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 14, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
XPress-DRLANTRONIX |
|
XPress-DR-ILANTRONIX |
|
References
- End-of-Life Announcementvendor-advisory
- VulnCheck Advisory: Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718third-party-advisory
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