CVE-2026-80154: Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass
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.
Affected Software
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
All firmware versions of the Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 are affected. Exposure is through the devices' web management portal.
What must an attacker have to exploit it?
An attacker does not need authentication or prior privileges. They need access to the web management portal and a valid session belonging to a logged-in user to be active during the attack window.
How does the attacker bypass the normal session checks?
Session tokens can be derived because they are generated deterministically from the device model and current time at one-second resolution. A crafted URI exploiting web-server file-extension path routing can then bypass the per-session source IP and User-Agent validation that would otherwise restrict use of the token from another source address.
What is the likely impact after successful exploitation?
An attacker can gain elevated privileges on the affected device. The compromise may also affect downstream devices attached through the vulnerable device's serial connections.