{"id":"CVE-2026-76070","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-76070","summary":"Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting…","details":"Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64 decoder's lack of output length validation against the fixed-size stack buffer to achieve remote code execution with root privileges, as the Boa web server executes the CGI environment as root.","published":"2026-08-24T16:17:22.963","modified":"2026-08-24T16:17:22.963","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/ozcanpng/CVE-2026-76070"},{"type":"WEB","url":"https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/"},{"type":"WEB","url":"https://www.netis-systems.com/products/NC63.html"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameter"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-24T16:17:22.963"}}