{"id":"CVE-2026-80154","state":"PUBLISHED","title":"Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass","description":"All firmware versions of Lantronix SLC8000, SLC9000, 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.","publishedAt":"2026-09-22T15:22:33.748Z","updatedAt":"2026-09-24T19:10:15.088Z","severity":{"score":8.9,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["LANTRONIX SLC8000","LANTRONIX EMG8500","LANTRONIX EMG7500","LANTRONIX SLB882","LANTRONIX SLCx-03","LANTRONIX SLCx-02","LANTRONIX SLC9000"],"affected":[{"vendor":"LANTRONIX","product":"SLC8000","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"EMG8500","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"EMG7500","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLB882","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLCx-03","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLCx-02","defaultStatus":"unaffected","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLC9000","defaultStatus":"unaffected","versions":[{"version":"*","status":"affected","versionType":"custom"}]}],"references":["https://revrb.net/2026/09/21/revrb-lantern.html","https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass"],"weaknesses":["CWE-330"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80154.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80154","state":"PUBLISHED","datePublished":"2026-09-22T15:22:33.748Z","dateUpdated":"2026-09-24T19:10:15.088Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-25T20:43:54.262Z"},"containers":{"cna":{"title":"Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass","descriptions":[{"lang":"en","value":"All firmware versions of Lantronix SLC8000, SLC9000, 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."}],"affected":[{"vendor":"LANTRONIX","product":"SLC8000","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"EMG8500","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"EMG7500","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLB882","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLCx-03","defaultStatus":"unknown","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLCx-02","defaultStatus":"unaffected","versions":[{"version":"*","status":"affected","versionType":"custom"}]},{"vendor":"LANTRONIX","product":"SLC9000","defaultStatus":"unaffected","versions":[{"version":"*","status":"affected","versionType":"custom"}]}],"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"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-330","lang":"en","description":"Use of Insufficiently Random Values","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-24T19:10:15.088Z"},"datePublic":"2026-09-18T00:00:00.000Z","credits":[{"lang":"en","value":"RE/VRb","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T17:22:31.916185Z","id":"CVE-2026-80154","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T17:44:14.925Z"}}]}}}