CVE-2026-80156

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The upload filename validation strips backslash characters but does not subsequently check for forward slashes when a backslash is detected; by supplying a filename containing both characters an attacker writes outside the intended upload directory to any writable path. Attackers can use this vulnerability to achieve complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-connected devices."}], "datePublic": "2026-09-18T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-22", "description": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}], "affected": [{"defaultStatus": "unaffected", "vendor": "LANTRONIX", "product": "SLC8000", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThan": "9.7.0.5"}]}, {"defaultStatus": "unaffected", "vendor": "LANTRONIX", "product": "EMG8500", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThan": "9.7.0.1"}]}, {"defaultStatus": "unaffected", "vendor": "LANTRONIX", "product": "EMG7500", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThan": "9.7.0.1"}]}, {"defaultStatus": "unknown", "vendor": "LANTRONIX", "product": "SLB882", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "vendor": "LANTRONIX", "product": "SLCx-03", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "vendor": "LANTRONIX", "product": "SLCx-02", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "vendor": "LANTRONIX", "product": "SLC9000", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThan": "9.7.0.2"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.4, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"}}], "references": [{"url": "https://revrb.net/2026/09/21/revrb-lantern.html", "name": "Researcher Disclosure", "tags": ["technical-description"]}, {"url": "https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/", "name": "SLC8000 Firmware", "tags": ["patch"]}, {"url": "https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/", "name": "EMG8500 Firmware", "tags": ["patch"]}, {"url": "https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/", "name": "EMG7500 Firmware", "tags": ["patch"]}, {"url": "https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/", "tags": ["patch"], "name": "SLC9000 Firmware"}, {"url": "https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-arbitrary-file-write-via-upload-filename-validation-bypass", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "RE/VRb", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "vulncheck"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-23T15:42:01.037508Z", "id": "CVE-2026-80156", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-23T15:42:10.927Z"}}]}}

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The upload filename validation strips backslash characters but does not subsequently check for forward slashes when a backslash is detected; by supplying a filename containing both characters an attacker writes outside the intended upload directory to any writable path. Attackers can use this vulnerability to achieve complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-connected devices."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-22", "description": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}], "providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-24T19:11:50.183Z"}}}, "cveMetadata": {"cveId": "CVE-2026-80156", "state": "PUBLISHED", "dateUpdated": "2026-09-24T19:11:50.183Z", "dateReserved": "2026-08-25T20:43:54.262Z", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "datePublished": "2026-09-22T15:23:24.784Z", "assignerShortName": "VulnCheck"}, "dataVersion": "5.2"}

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The upload filename validation strips backslash characters but does not subsequently check for forward slashes when a backslash is detected; by supplying a filename containing both characters an attacker writes outside the intended upload directory to any writable path. 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