Vulnerability details
CVE-2026-109439
LANTRONIX XPress-DRLANTRONIX XPress-DR-I
Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
CVSS 4.0
9.3Critical
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| LANTRONIX | XPress-DR | v ≤ 8.1.0.0 | CVEProject cvelistV5 (CNA) |
| LANTRONIX | XPress-DR-I | v ≤ 8.1.0.0 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://cdn.lantronix.com/wp-content/uploads/pdf/PCN-753-Rev-B-EOL-Notice-XPRESS.pdf?xnotes__c=I%20am%20interested%20in%20the%20XPress%20DR%20/%20XPress%20DR-IAP. vendor-advisory
- https://www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718 third-party-advisory
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Details
- Published
- 2026-10-14
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 26 · Low
Exploit prediction (EPSS)
0.61%
Probability of exploitation in 30 days
49.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function