CVE-2026-109439 (GCVE-0-2026-109439)

Vulnerability from cvelistv5 – Published: 2026-10-14 16:45 – Updated: 2026-10-14 16:45 Unsupported When Assigned
VLAI
Title
Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718
Summary
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.
Severity
9.3 (Critical)
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6106 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
LANTRONIX XPress-DR Affected: 0 , ≤ 8.1.0.0 (custom)
guessed Create a notification for this product.
LANTRONIX XPress-DR-I Affected: 0 , ≤ 8.1.0.0 (custom)
guessed Create a notification for this product.
Date Public
2026-10-14 00:00
Credits
D6fault
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
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          "product": "XPress-DR",
          "vendor": "LANTRONIX",
          "versions": [
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          "value": "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."
        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
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            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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              "description": "Missing Authentication for Critical Function",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-14T16:45:49.338Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "End-of-Life Announcement",
          "tags": [
            "vendor-advisory"
          ],
          "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."
        },
        {
          "name": "VulnCheck Advisory: Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718",
          "tags": [
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          "url": "https://www.vulncheck.com/advisories/lantronix-xpress-dr-unauthenticated-configuration-write-via-udp-30718"
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      "source": {
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      "tags": [
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      "title": "Lantronix XPress-DR 8.1.0.0 Unauthenticated Configuration Write via UDP 30718",
      "workarounds": [
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          "lang": "en",
          "value": "To mitigate this vulnerability, connect to the device via Telnet or CLI, open the Security settings (option 6), set \u201cDisable port 77FEh\u201d to Y, then save and exit to disable port 30718 (77FEh)."
        }
      ],
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-109439",
    "datePublished": "2026-10-14T16:45:49.338Z",
    "dateReserved": "2026-10-12T15:52:36.683Z",
    "dateUpdated": "2026-10-14T16:45:49.338Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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          }
        ],
        "id": "CVE-2026-109439",
        "lastModified": "2026-10-14T17:18:23.253",
        "metrics": {
          "cvssMetricV31": [
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          "cvssMetricV40": [
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                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
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                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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            "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."
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}



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