CVE-2026-76071

CVSS 9.8 (critical) · published 2026-08-24

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.

Weakness: CWE-121

Source: NVD CVE-2026-76071

References

• https://github.com/ozcanpng/CVE-2026-76071
• https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/
• https://www.netis-systems.com/products/NC63.html
• https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.