🛡️ CVE-2026-36540
🟠 CVSS 7.3 — High ✅ No Known Exploit CWE-77 NVD
7.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 7.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE CWE-77
Public Exploit ✅ No
Source NVD
Published 2026-05-27
Updated 2026-06-02
Modified 2026-05-28
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

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