CVE-2026-80155Lantronix Autonomous Out-of-Band Devices Unauthenticated Authentication Bypass via snprintf Path Truncation
Updated under an hour ago ()
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It affects LANTRONIX SLC8000 and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 an authentication bypass vulnerability in the web management portal upload endpoint that allows unauthenticated attackers to read sensitive configuration files and upload files to arbitrary filesystem locations, leading to remote code execution. The web configuration server constructs the session cookie file path using snprintf with a fixed-size buffer; by supplying a cookie value of a specific length an attacker causes the path to truncate at the required delimiter and leverages path traversal to redirect authentication validation to an arbitrary on-disk file such as the local user database, bypassing all session checks. 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.
- CVSS
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
LANTRONIX SLC8000 lantronix:slc8000 (from the name) | before 9.7.0.5 | CNA record |
LANTRONIX EMG8500 lantronix:emg8500 (from the name) | before 9.7.0.1 | CNA record |
LANTRONIX EMG7500 lantronix:emg7500 (from the name) | before 9.7.0.1 | CNA record |
LANTRONIX SLB882 lantronix:slb882 (from the name) | all versions | CNA record |
LANTRONIX SLCx-03 lantronix:slcx_03 (from the name) | all versions | CNA record |
LANTRONIX SLCx-02 lantronix:slcx_02 (from the name) | all versions | CNA record |
LANTRONIX SLC9000 lantronix:slc9000 (from the name) | before 9.7.0.2 | CNA record |
References
- https://revrb.net/2026/09/21/revrb-lantern.htmltechnical-description
- https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/patch
- https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/patch
- https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/patch
- https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/patch
- https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-unauthenticated-authentication-bypass-via-snprintf-path-truncationthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.