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Vulnerability record · CVE-2026-36540 · published 27 May 2026

CVE-2026-36540: Command injection vulnerability

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.

7.3 CVSS 3.1 High EPSS 1.3% · top 30.3% CWE-77 · Command injection Deferred
7.3CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
5 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

LinkTags
https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36540/readme.md
https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36540/readme.md

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Source: NIST National Vulnerability Database (record CVE-2026-36540), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.