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Overlong Username in Lantronix Serial Console Server WebSSH Truncates the Device IP Suffix in snprintf, Redirecting SSH Connections to Attacker-Controlled Hosts

Last refreshed2026-09-29

Status: NEW  |  Advisory ID: CVE-2026-80148

Key Details

CVECVE-2026-80148
CVSS Score / Version8.6 (High) / CVSS v3.1
Updated2026-09-26
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS Proseattack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is none; availability impact is none.
Classified asCWE-918 (Server-Side Request Forgery (SSRF))

What to Know

Lantronix SLC8000 before firmware v9.7.0.3, SLC9000 before firmware v9.7.0.2, 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. (NVD)

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-80148
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-80148