CVE-2026-36540
HIGH EPSS 71.1%
Published May 27, 20261mo ago · Modified Jun 17, 20261w ago
7.3 CVSS 3.1
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low
Threat Intelligence
EPSS Exploit Probability
71.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-77 Command Injection Injection
References 2
- netis-system.com http://netis-system.com
- github.com https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36540/readme.md
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.