Vulnerability · Published Sep 22, 2026 · Assigned by VulnCheck

CVE-2026-80154Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass

Critical 9.6

In plain English

A critical-severity weak randomness in EMG7500 from LANTRONIX. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.6%top 49.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

All firmware versions of Lantronix SLC8000, SLC9000, 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 products (as reported)

Vendor	Product	Versions
LANTRONIX	SLC8000	*
LANTRONIX	EMG8500	*
LANTRONIX	EMG7500	*
LANTRONIX	SLB882	*
LANTRONIX	SLCx-03	*
LANTRONIX	SLCx-02	*
LANTRONIX	SLC9000	*

Weakness: CWE-330 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

Researcher Disclosure technical-description
https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass third-party-advisory