CVE-2026-109439— Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
Quick assessment
Affected
LANTRONIX XPress-DR
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 UD
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| LANTRONIX | XPress-DR | ≤ 8.1.0.0 |
affected |
| LANTRONIX | XPress-DR-I | ≤ 8.1.0.0 |
affected |
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I. Basic Information for CVE-2026-109439
Vulnerability Information
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Vulnerability Title
Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| LANTRONIX | XPress-DR | 0 ~ 8.1.0.0 | - |
|
| LANTRONIX | XPress-DR-I | 0 ~ 8.1.0.0 | - |
|
II. Public POCs for CVE-2026-109439
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-109439 (1)
Other References for CVE-2026-109439 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-109439
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