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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-24
• Weakness: CWE-330

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

• LANTRONIX EMG7500: all versions
• LANTRONIX EMG8500: all versions
• LANTRONIX SLB882: all versions
• LANTRONIX SLC8000: all versions
• LANTRONIX SLC9000: all versions
• LANTRONIX SLCx-02: all versions
• LANTRONIX SLCx-03: all versions

References

• https://revrb.net/2026/09/21/revrb-lantern.html
• https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass

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