Lantronix SLC8000/EMG8500/EMG7500/SLB882 WebSSH/WebTelnet Listener snprintf Username server-side request forgery

Summaryinfo

A vulnerability categorized as critical has been discovered in Lantronix SLC8000, EMG8500, EMG7500 and SLB882. This issue affects the function snprintf of the component WebSSH/WebTelnet Listener. Such manipulation of the argument Username leads to server-side request forgery. This vulnerability is referenced as CVE-2026-80148. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Lantronix SLC8000, EMG8500, EMG7500 and SLB882 (affected version unknown). It has been rated as critical. Affected by this issue is the function snprintf of the component WebSSH/WebTelnet Listener. The manipulation of the argument username with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Lantronix SLC8000 before firmware v9.7.0.3, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882 contain a server-side request forgery vulnerability in the WebSSH/WebTelnet listener that allows unauthenticated attackers to cause the affected device to establish SSH connections to attacker-controlled endpoints. The custom shellinaboxd builds its SSH connection target using a snprintf call with user-supplied input; by supplying an overlong username string an attacker causes the device IP suffix to be truncated, redirecting the resulting connection to an arbitrary host. Attackers can use this capability to enumerate or communicate with internal network endpoints that would otherwise be inaccessible.

The advisory is shared for download at revrb.net. This vulnerability is handled as CVE-2026-80148 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. 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).

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

License

• commercial

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