Buffer overflow in Lantronix Emg7500
CVE-2026-80147
Lantronix SLC8000/SLC9000 before firmware v9.7.0.2, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882/SLCx-03/SLCx-02 contain a stack-based buffer overflow vulnerability that allows authenticated attackers to potentially execute arbitrary code by exploiting an undocumented mfc eeprom write command that copies unbounded user input into a bounded stack buffer before passing it to a system() call. Attackers can authenticate as any user to the terminal or CLI interface and supply an oversized input to trigger the overflow, potentially achieving complete loss of confidentiality, integrity, and availability on the affected device and impacting downstream serial-attached devices.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- revrb.net/2026/09/21/revrb-lantern.html (technical-description)
- ts.lantronix.com/ftp/slc8000/9.7.0.2R1/ (patch)
- ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/ (patch)
- ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/ (patch)
- www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-stack-bas… (third-party-advisory)
- ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/ (patch)
Frequently asked questions
- What is CVE-2026-80147?
- CVE-2026-80147 is a critical-severity vulnerability in Lantronix Emg7500, classified under Stack-based Buffer Overflow. CVSS score: 9.9/10. Published 2026-09-22.
- How severe is CVE-2026-80147?
- Critical severity. CVSS v3 base score is 9.9 out of 10.