CVE-2026-76071
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Netis Systems | NC63 | 0 <= 3.0.0.3327 | affected |
Weaknesses
- CWE-121: Stack-based Buffer Overflow
References
- https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/
- https://github.com/ozcanpng/CVE-2026-76071
- https://www.netis-systems.com/products/NC63.html
- https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter
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