{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80154", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-25T20:43:54.262Z", "datePublished": "2026-09-22T15:22:33.748Z", "dateUpdated": "2026-09-22T15:22:33.748Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-22T15:22:33.748Z"}, "title": "Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass", "descriptions": [{"lang": "en", "value": "All firmware versions of Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 contain an authentication bypass vulnerability in the web management portal that allows unauthenticated attackers to derive valid session tokens of logged-in users and bypass source IP and User-Agent validation. Session tokens are generated deterministically from the device model and the current time at one-second resolution, resulting in a small enumerable set of possible active tokens. Attackers can construct a crafted URI that exploits file extension handling in the web server path routing to bypass per-session source-address validation, then use a derived token from a different source address to gain elevated privileges on the affected device and potentially impact downstream serial-attached devices."}], "datePublic": "2026-09-18T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-330", "description": "Use of Insufficiently Random Values", "type": "CWE"}]}], "affected": [{"defaultStatus": "unknown", "vendor": "LANTRONIX", "product": "SLC8000", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "vendor": "LANTRONIX", "product": "EMG8500", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "vendor": "LANTRONIX", "product": "EMG7500", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"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"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "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": "HIGH", "baseScore": 8.9, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/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": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.6, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "RE/VRb", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "vulncheck"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "SLC8000", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "EMG8500", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "EMG7500", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SLB882", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SLCx-03", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "SLCx-02", "vendor": "LANTRONIX", "versions": [{"status": "affected", "version": "*", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "All firmware versions of Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 contain an authentication bypass vulnerability in the web management portal that allows unauthenticated attackers to derive valid session tokens of logged-in users and bypass source IP and User-Agent validation. Session tokens are generated deterministically from the device model and the current time at one-second resolution, resulting in a small enumerable set of possible active tokens. Attackers can construct a crafted URI that exploits file extension handling in the web server path routing to bypass per-session source-address validation, then use a derived token from a different source address to gain elevated privileges on the affected device and potentially impact downstream serial-attached devices."}], "id": "CVE-2026-80154", "lastModified": "2026-09-22T16:18:01.767", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.6, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 6.0, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-09-22T16:18:01.767", "references": [{"source": "disclosure@vulncheck.com", "url": "https://revrb.net/2026/09/21/revrb-lantern.html"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-330"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{}

{}