CVE-2026-80154

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

State: Published
Severity: 8.9 High
Published: Sep 22, 2026
Updated: Sep 24, 2026
Reserved: Aug 25, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.9 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	VulnCheck
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-330 Use of Insufficiently Random Values

Affected Products

Product	Versions
SLC8000LANTRONIX	*Affected
EMG8500LANTRONIX	*Affected
EMG7500LANTRONIX	*Affected
SLB882LANTRONIX	*Affected
SLCx-03LANTRONIX	*Affected
SLCx-02LANTRONIX	*Affected
SLC9000LANTRONIX	*Affected

References

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.