{"schema":"threatline.record/2","record":{"id":"CVE-2026-109439","aliases":[],"summary":"Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718","details":"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.","categories":["Unclassified"],"product":"XPress-DR","vendor":"LANTRONIX","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109439","source_modified_at":"2026-10-16T17:15:34.637Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"XPress-DR","vendor":"LANTRONIX","versions":[{"status":"affected","version":"0","versionType":"custom","lessThanOrEqual":"8.1.0.0"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109439","source_modified_at":"2026-10-16T17:15:34.637Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"XPress-DR-I","vendor":"LANTRONIX","versions":[{"status":"affected","version":"0","versionType":"custom","lessThanOrEqual":"8.1.0.0"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00618,"percentile":0.4899,"score_date":"2026-10-23"},"published_at":"2026-10-14T16:45:49.338Z","modified_at":"2026-10-16T17:15:34.637Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109439","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-16T17:15:34.637Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109439","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"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.","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-16T16:48:53.210449Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-16T17:15:34.637Z","content_hash":"2276abd335daae1276316b0e0b76d7b76c207a8d07c8d306e40b17e82f59b8f2"}}