What’s Vulnerable › Vulnerabilities

CVE-2026-76071: Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-12
• Weakness: CWE-121

Description

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 products

• Netis Systems NC63: through 3.0.0.3327

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

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