---
id: CVE-2026-80155
title: >-
  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 managem…
summary: >-
  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 managem…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: LANTRONIX
product: SLC8000
affected:
  - SLC8000 < 9.7.0.5
  - EMG8500 < 9.7.0.1
  - EMG7500 < 9.7.0.1
  - SLB882
  - SLCx-03
  - SLCx-02
published: '2026-09-22'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:17:31.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80155'
references:
  - url: 'https://revrb.net/2026/09/21/revrb-lantern.html'
    label: disclosure@vulncheck.com
  - url: 'https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/'
    label: disclosure@vulncheck.com
  - url: 'https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/'
    label: disclosure@vulncheck.com
  - url: 'https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/'
    label: disclosure@vulncheck.com
  - url: 'https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-unauthenticated-authentication-bypass-via-snprintf-path-truncation
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.01667
epssPercentile: 0.75766
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T15:42:37.923706Z'
ingestedAt: '2026-09-22T16:06:00.480Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.