CVE-2026-36540

Published: May 27, 2026Modified: Jul 5, 2026Deferred

7.3

Vector

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

Exploitability: 3.9 / Impact: 3.4

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Related CWEs

CWE-77

Improper Neutralization of Special Elements used in a Command ('Command Injection')

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

References (2)

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

Source: cve@mitre.org

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

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.