CVE-2026-76071: critical vulnerability in Netis Systems NC63
Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter
Published · Updated
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48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.3epss 1.4%
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.
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
Affected products
Netis Systems · NC63public PoCs found — 2
cve_referencegithub.com/ozcanpng/CVE-2026-76071★ 1cve_referenceozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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