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CVE-2026-19348 – Unauthenticated OS Command Injection (RCE) – Shenzhen Aitemi M300 Wi-Fi Repeater r0

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Summary

CVE-2026-19348 is an unauthenticated OS command injection vulnerability in the Shenzhen Aitemi M300 Wi-Fi Repeater. A remote attacker can inject arbitrary shell commands through the smacfilter_conf handling in /protocol.csp, achieving remote code execution on the device. The issue is rated Critical (CVSS v3.1 base score 9.8).

Technical details

  • Root cause: User-controlled input to the smacfilter_conf operation is passed into sprintf and used to build system commands without sanitization or escaping (CWE-77 / CWE-78 command injection).
  • Trigger conditions: An HTTP request to the /protocol.csp endpoint using the smacfilter_conf set/add operation, supplying malicious values in the enable, name, or mac (MAC address) parameters.
  • Attack vector: Network (AV:N). No authentication and no user interaction are required.
  • Impact: Injected commands execute in the context of the device’s web backend (running as root), yielding full compromise of confidentiality, integrity, and availability.

Affected software

  • Shenzhen Aitemi M300 Wi-Fi Repeater, version r0-ea7890a.

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor patch has been published for this vulnerability at the time of writing. Monitor Shenzhen Aitemi for firmware updates and apply them once available.
  • If no patch: Do not expose the device’s web management interface to untrusted networks or the internet. Restrict access to /protocol.csp to trusted management hosts using upstream network/firewall controls, segment the repeater onto an isolated network, and consider replacing the device where remote exposure cannot be eliminated.

References

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