CVE-2026-80146 LANTRONIX CVE debrief

Who should care

System administrators and security teams responsible for Lantronix devices should assess exposure and apply firmware updates to mitigate the vulnerability. They should also review compensating controls for exposed systems while remediation is scheduled and verified, and track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

CVE-2026-80146 is a critical vulnerability affecting Lantronix devices, allowing authenticated attackers to potentially execute arbitrary code. System administrators and security teams should assess exposure and apply firmware updates to mitigate the vulnerability.

• Potential loss of confidentiality, integrity, and availability on affected devices
• Impact on downstream serial-attached devices
• Need for firmware updates to address the vulnerability
• Potential for authenticated attackers to execute arbitrary code

Technical summary

The vulnerability is caused by a stack-based buffer overflow in the mfc eeprom read command, which allows authenticated attackers to potentially execute arbitrary code. The affected devices include Lantronix SLC8000, SLC9000, EMG8500, and EMG7500. The command copies unbounded user input into a bounded stack buffer before passing it to a system() call, allowing attackers to supply an oversized input to trigger the overflow. Firmware updates have been released to address the issue, and defenders should review and apply these updates to mitigate the vulnerability.

Defensive priority

High

Recommended defensive actions

• Review and apply firmware updates for affected Lantronix devices
• Restrict access to the terminal or CLI interface
• Monitor for suspicious activity on affected devices
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 9.4 and critical severity. The vendor has released firmware updates to address the issue. Affected product deployments should be reviewed for exposure, and firmware updates should be applied to mitigate the vulnerability. Defenders should verify the authenticity of user input and monitor for suspicious activity on affected devices.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.