{"id":"CVE-2026-36540","aliases":["EUVD-2026-32687","GHSA-x2w7-3ffq-rg3v"],"status":"published","title":"Netis AC1200 Router NC21 V4.0.1.4296 is vulnerable to unauthenticated command injection via the ...","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.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.01431,"percentile":0.73387,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-77"],"published":"2026-05-27T00:00:00Z","modified":"2026-10-19T22:10:00Z","references":[{"url":"https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36540/readme.md","tags":["exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-36540"},{"url":"http://netis-system.com"},{"url":"https://github.com/advisories/GHSA-x2w7-3ffq-rg3v"}],"sources":{"cve":[{"id":"CVE-2026-36540","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.","status":"published","published":"2026-05-27T00:00:00Z","modified":"2026-07-05T01:35:00.481Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"adp"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:19:55.176387Z"}],"euvd":[{"id":"EUVD-2026-32687","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.","status":"published","published":"2026-05-27T00:00:00Z","modified":"2026-07-05T01:35:00Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T18:20:14.2986Z"}],"ghsa":[{"id":"GHSA-x2w7-3ffq-rg3v","title":"Netis AC1200 Router NC21 V4.0.1.4296 is vulnerable to unauthenticated command injection via the ...","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.","status":"published","published":"2026-05-27T15:33:11Z","modified":"2026-05-28T15:39:45Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T15:08:21.544183Z"}],"nvd":[{"id":"CVE-2026-36540","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.","status":"published","published":"2026-05-27T14:16:45.637Z","modified":"2026-10-19T22:10:00.13Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-77"],"updated_at":"2026-11-02T14:12:20.511562Z"}]}}