{"id":"CVE-2026-80156","published":"2026-09-22T16:18:02.083","lastModified":"2026-09-24T20:17:31.857","description":"Lantronix SLC8000 before firmware v9.7.0.5, SLC9000 before firmware v9.7.0.2, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882/SLCx-03/SLCx-02 contain a path traversal vulnerability in the web management portal upload endpoint that allows authenticated attackers to write arbitrary data to any location on the device's filesystem, leading to remote code execution. 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.","cvssScore":9.1,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-22"],"vendors":[],"products":[],"references":[{"url":"https://revrb.net/2026/09/21/revrb-lantern.html","tags":[]},{"url":"https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/","tags":[]},{"url":"https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/","tags":[]},{"url":"https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/","tags":[]},{"url":"https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/","tags":[]},{"url":"https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-arbitrary-file-write-via-upload-filename-validation-bypass","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability allows authenticated attackers to write arbitrary data to any location on the device's filesystem, leading to remote code execution by exploiting a path traversal flaw in the web management portal upload endpoint.","exploitability":"Exploitation requires authentication and involves crafting a specific filename with both backslash and forward slash characters, making it moderately difficult to exploit.","blast_radius":"If exploited, this vulnerability can result in complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-connected devices.","remediation":"Upgrade to firmware v9.7.0.5 or later for SLC8000, v9.7.0.2 or later for SLC9000, v9.7.0.1 or later for EMG8500/EMG7500, and the latest firmware for SLB882/SLCx-03/SLCx-02.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","auth-bypass","web","firmware"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-28T08:50:50.968Z"}}