CVE-2026-80147: Lantronix SLC8000/SLC9000 stack buffer overflow in mfc eeprom command

CVE-2026-80147 · Severity: critical · CVSS 9.9 · Published 2026-09-22

Lantronix out-of-band serial console servers used in data centers, telecom networks, and government infrastructure contain a stack buffer overflow vulnerability in an undocumented firmware command. An authenticated attacker can supply oversized input to the mfc eeprom write command to execute arbitrary code with full device privileges, compromising the device and any serial-attached systems it manages, such as network infrastructure or physical plant controls.

Technologies: Lantronix EMG7500, Lantronix EMG8500, Lantronix SLB882, Lantronix SLC8000, Lantronix SLC9000, Lantronix SLCx-02, Lantronix SLCx-03. Vendors: Lantronix.

Quick answers

Is CVE-2026-80147 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-80147 being exploited in the wild.
How severe is CVE-2026-80147?
Critical severity, with a CVSS score of 9.9, published 22 September 2026.
Which products and versions are affected?
Lantronix EMG7500 before 9.7.0.1; Lantronix EMG8500 before 9.7.0.1; Lantronix SLB882 all firmware versions; Lantronix SLC8000 before 9.7.0.2; and 3 more.
Is there a fix for CVE-2026-80147?
A patch was published on 2026-09-18: Firmware 9.7.0.2 for SLC9000 released; 9.7.0.1 for EMG series Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-80147 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-80147?
Check whether you run Lantronix EMG7500, Lantronix EMG8500, Lantronix SLB882 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a stack-based buffer overflow in 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 to the terminal or CLI interface as any user and trigger the overflow by supplying oversized input, achieving remote code execution. The SLB882, SLCx-02, and SLCx-03 device lines are affected across all firmware versions with no patches planned; SLC8000/SLC9000 and EMG series have fixes available in recent firmware releases.

Affected products

  • Lantronix SLC8000 before 9.7.0.2
  • Lantronix SLC9000 before 9.7.0.2
  • Lantronix EMG8500 before 9.7.0.1
  • Lantronix EMG7500 before 9.7.0.1
  • Lantronix SLB882 all firmware versions
  • Lantronix SLCx-03 all firmware versions
  • Lantronix SLCx-02 all firmware versions

Timeline

  • 2026-09-21: disclosed: Research disclosed by RE/VRb LLC
  • 2026-09-22: advisory: CVE-2026-80147 published
  • 2026-09-18: patched: Firmware 9.7.0.2 for SLC9000 released; 9.7.0.1 for EMG series

References

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