Is CVE-2026-36540 actively exploited?

No active exploitation of CVE-2026-36540 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-36540 be exploited remotely?

Yes. CVE-2026-36540 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-36540?

CVE-2026-36540 has a CVSS score of 7.3 (HIGH).

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HIGH

CVE-2026-36540

Published: May 27, 2026· Updated: May 28, 2026

7.3

CVSS v3.1

Official Description

Netis AC1200 Router NC21 V4.0.1.4296 is vulnerable to unauthenticated command injection via the /cgi-bin/skk_set.cgi endpoint. The password and new_pwd_confirm POST parameters are passed directly to the underlying OS shell without sanitization. An attacker can inject arbitrary shell commands by wrapping them in backticks (`) and encoding them in base64. Because the endpoint requires no authentication, any device on the LAN can achieve full Remote Code Execution on the router's operating system with a single HTTP POST request.

NVD Source

Technical Analysis

CVE-2026-36540 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.