Lantronix SLC8000/EMG8500/EMG7500/SLB882/SLCx-03/SLCx-02 Web Management Portal Upload Endpoint path traversal

Summaryinfo

A vulnerability identified as very critical has been detected in Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03 and SLCx-02. This affects an unknown part of the component Web Management Portal Upload Endpoint. This manipulation causes path traversal. This vulnerability is tracked as CVE-2026-80156. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03 and SLCx-02 and classified as very critical. Affected by this vulnerability is some unknown functionality of the component Web Management Portal Upload Endpoint. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Lantronix SLC8000 before firmware v9.7.0.5, 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.

It is possible to read the advisory at revrb.net. This vulnerability is known as CVE-2026-80156 since 08/25/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/22/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Lantronix

Name

• EMG7500
• EMG8500
• SLB882
• SLC8000
• SLCx-02
• SLCx-03

License

• commercial

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