Answer in brief
CVE-2026-109439 records a Critical severity (CVSS 9.3) vulnerability in Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718. The current sources do not mark it as known exploited. The current feed maps LANTRONIX/XPress-DR (generic), LANTRONIX/XPress-DR-I (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps LANTRONIX/XPress-DR (generic), LANTRONIX/XPress-DR-I (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| LANTRONIX/XPress-DRgeneric | >=0 <=8.1.0.0 | Not reported |
| LANTRONIX/XPress-DR-Igeneric | >=0 <=8.1.0.0 | Not reported |
Published upstream
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.