CVE Catalog

CVE-2026-109439

CriticalCVSS 9.8
Published: Translated: NVD NIST

Summary

A missing authentication vulnerability in Lantronix XPress-DR and XPress-DR-I (CoBos-family) firmware through 8.1.0.0 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.

Risk Assessment

An attacker can completely take over the device configuration, potentially leading to unauthorized network access or disruption of device operations.

Recommendation

Due to end-of-support, consider replacing XPress-DR devices with newer models or apply additional network security measures such as firewalls and network segmentation.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS