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

Summaryinfo

A vulnerability was found in Lantronix EMG7500, EMG8500, SLB882, SLC8000, SLCx-02 and SLCx-03 and classified as very critical. Affected by this vulnerability is an unknown functionality of the component Web Management Portal Upload Endpoint. Executing a manipulation of the argument cookie can lead to path traversal. This vulnerability is handled as CVE-2026-80155. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Lantronix EMG7500, EMG8500, SLB882, SLC8000, SLCx-02 and SLCx-03 and classified as very critical. This vulnerability affects an unknown code of the component Web Management Portal Upload Endpoint. The manipulation of the argument cookie 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. CVE summarizes:

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 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.

The advisory is shared for download at revrb.net. This vulnerability was named CVE-2026-80155 since 08/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/22/2026). The MITRE ATT&CK project declares the attack technique as T1006.

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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