Vulnerability in Lantronix Emg7500
CVE-2026-80154
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (50.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- revrb.net/2026/09/21/revrb-lantern.html (technical-description)
- www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictab… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-80154?
- CVE-2026-80154 is a critical-severity vulnerability in Lantronix Emg7500, classified under Use of Insufficiently Random Values. CVSS score: 9.6/10. Published 2026-09-22.
- How severe is CVE-2026-80154?
- Critical severity. CVSS v3 base score is 9.6 out of 10.