{"id":"CVE-2026-109439","revision":"3ff8493385604587b5f298387410eff3","records":[{"revision":"3ff8493385604587b5f298387410eff3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109439","aliases":[],"title":"Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718","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.","state":0,"publishedAt":"2026-10-14T16:45:49.338+00:00","modifiedAt":"2026-10-16T17:15:34.637+00:00","affected":[{"ecosystem":"Vendor product","name":"XPress-DR","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"LANTRONIX\",\n                    \"product\": \"XPress-DR\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"custom\",\n                            \"lessThanOrEqual\": \"8.1.0.0\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"XPress-DR-I","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"LANTRONIX\",\n                    \"product\": \"XPress-DR-I\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"custom\",\n                            \"lessThanOrEqual\": \"8.1.0.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["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.","https://www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109439","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109439","identifiers":["CVE-2026-109439"]},"retained":false,"historicalAffected":[]}],"coverage":[]}