---
title: "CVE-2026-80155: Lantronix SLC8000 - Authentication Bypass"
description: "Lantronix SLC8000 < 9.7.0.5, EMG8500/EMG7500 < 9.7.0.1, and all versions of SLB882/SLCx-03/SLCx-02 contain an authentication bypass caused by path traversal in the web management portal upload endpoint, letting unauthenticated attackers read sensitive files and upload arbitrary files leading to remote code execution, exploit requires crafted cookie value."
url: https://panop.io/threat-heartbeat/CVE-2026-80155/
---

# CVE-2026-80155 Lantronix SLC8000 - Authentication Bypass

Lantronix SLC8000 < 9.7.0.5, EMG8500/EMG7500 < 9.7.0.1, and all versions of SLB882/SLCx-03/SLCx-02 contain an authentication bypass caused by path traversal in the web management portal upload endpoint, letting unauthenticated attackers read sensitive files and upload arbitrary files leading to remote code execution, exploit requires crafted cookie value.

CVSS base score 10.0 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

1.03% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80155)

## Details

Type

Authentication Bypass

Impact

Remote Code Execution, Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to firmware v9.7.0.5 for SLC8000, v9.7.0.1 for EMG8500/EMG7500, or latest firmware for other affected models.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-80155](https://nvd.nist.gov/vuln/detail/CVE-2026-80155)
- [https://revrb.net/2026/09/21/revrb-lantern.html](https://revrb.net/2026/09/21/revrb-lantern.html)
- [https://ts.lantronix.com/ftp/emg/EMG\_7500/9.7.0.1R2/](https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/)
- [https://ts.lantronix.com/ftp/emg/EMG\_8500/9.7.0.1R2/](https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/)
- [https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/](https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/)
- [https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-unauthenticated-authentication-bypass-via-snprintf-path-truncation](https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-unauthenticated-authentication-bypass-via-snprintf-path-truncation)
- [https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/](https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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