Paper/Archive/CVE-2026-80154

CVE-2026-80154

LANTRONIX SLC8000 — Lantronix Autonomous Out-of-Band Devices Predictable Session Token with Validation Bypass

CVSS 9.6 (CNA)9.6 / 10 × 3028.8 Not in CISA KEV+300.0 EPSS percentile 50.1.501 × 2010.0 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

SLC8000all versions–CNA

EMG8500all versions–CNA

EMG7500all versions–CNA

SLB882all versions–CNA

SLCx-03all versions–CNA

SLCx-02all versions–CNA

SLC9000all versions–CNA

Scores by source

VulnCheck (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

VulnCheck (CNA)8.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

writeuprevrb.net/2026/09/21/revrb-lantern.html writeupvulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass