{"id":"CVE-2026-76071","title":"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…","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 an oversized destHost parameter to the ipFilterList=mod…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-121"],"published":"2026-08-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:43:32.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76071","references":[{"url":"https://github.com/ozcanpng/CVE-2026-76071","label":"disclosure@vulncheck.com"},{"url":"https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/","label":"disclosure@vulncheck.com"},{"url":"https://www.netis-systems.com/products/NC63.html","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter","label":"disclosure@vulncheck.com"}],"tags":["nvd","exploit-available"],"epss":0.01418,"epssPercentile":0.71633,"exploits":{"github":1,"githubRepos":["https://github.com/ozcanpng/CVE-2026-76071"],"checkedAt":"2026-09-24T20:52:15.414Z"},"exploitAvailable":true,"ingestedAt":"2026-09-24T20:51:40.223Z","slug":"CVE-2026-76071","body":"## Overview\n\nNetis 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.3,"exploitation":12,"ransomware":0},"changes":[]}