{"id":"CVE-2026-76071","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-76071","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 supplying…","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 supplying an oversized destHost parameter to the ipFilterList=mod action in netis.cgi. Attackers can exploit widthless sscanf conversions that copy user-supplied input into fixed-size stack buffers before authentication is verified, achieving remote code execution as root due to the Boa web server executing the CGI environment with root privileges.","published":"2026-08-24T16:17:23.117","modified":"2026-08-24T16:17:23.117","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-2026-76071"},{"type":"WEB","url":"https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-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-desthost-parameter"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-24T16:17:23.117"}}