Lantronix SLC8000/EMG8500/EMG7500/SLB882/SLCx-03/SLCx-02 Web Management Portal improper authentication

Summaryinfo

A vulnerability, which was classified as very critical, was found in Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03 and SLCx-02. This impacts an unknown function of the component Web Management Portal. Such manipulation leads to improper authentication. This vulnerability is traded as CVE-2026-80154. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03 and SLCx-02. Affected by this issue is some unknown functionality of the component Web Management Portal. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

All firmware versions of Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 contain an authentication bypass vulnerability in the web management portal that allows unauthenticated attackers to derive valid session tokens of logged-in users and bypass source IP and User-Agent validation. Session tokens are generated deterministically from the device model and the current time at one-second resolution, resulting in a small enumerable set of possible active tokens. Attackers can construct a crafted URI that exploits file extension handling in the web server path routing to bypass per-session source-address validation, then use a derived token from a different source address to gain elevated privileges on the affected device and potentially impact downstream serial-attached devices.

The advisory is available at revrb.net. This vulnerability is handled as CVE-2026-80154 since 08/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/22/2026).

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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