CVE-2026-36540
Last modified
CVE-2026-36540 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. 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. EPSS estimates a 1.50% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness Enumeration
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-36540?
How severe is CVE-2026-36540?
How do I fix CVE-2026-36540?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-3652The ARForms plugin for WordPress is vulnerable to Stored Cro…7.2
- CVE-2026-36521PublicCMS V5.202506.d has a Cross Site Scripting (XSS) vulne…6.1
- CVE-2026-3653Rejected reason: ** REJECT ** DO NOT USE THIS CANDIDATE NUMB…
- CVE-2026-36537ThingsBoard v4.3.0.1 is vulnerable to an authentication bypa…9.8
- CVE-2026-36538Netis AC1200 Router NC21 V4.0.1.4296 contains a hard-coded r…7.3
- CVE-2026-36539Netis AC1200 Router NC21 V4.0.1.4296 exposes a CGI endpoint …7.3
- CVE-2026-3655The OTP Login With Phone Number, OTP Verification plugin for…9.8
- CVE-2026-3657The My Sticky Bar plugin for WordPress is vulnerable to SQL …7.5
- CVE-2026-36574A DLL hijacking vulnerability in Wassimulator (GitHub) Cactu…7.8
- CVE-2026-36576An OS command injection vulnerability in the app.py componen…9.8
- CVE-2026-3658The Appointment Booking Calendar — Simply Schedule Appointme…7.5
- CVE-2026-3659The WP Circliful plugin for WordPress is vulnerable to Store…6.4
Are you affected by CVE-2026-36540?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST