{"id":"CVE-2026-76070","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 submitting an oversized Base64-encoded password to the login hand…","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 an oversized Base64-encoded password to the login hand…","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-2026-76070","references":[{"url":"https://github.com/ozcanpng/CVE-2026-76070","label":"disclosure@vulncheck.com"},{"url":"https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-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-login-password-parameter","label":"disclosure@vulncheck.com"}],"tags":["nvd","exploit-available"],"epss":0.01338,"epssPercentile":0.70019,"exploits":{"github":1,"githubRepos":["https://github.com/ozcanpng/CVE-2026-76070"],"checkedAt":"2026-09-24T20:52:15.414Z"},"exploitAvailable":true,"ingestedAt":"2026-09-24T20:51:40.223Z","slug":"CVE-2026-76070","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 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.\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":[]}