What’s Vulnerable › Vulnerabilities

CVE-2026-76070: Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% 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 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.

Affected products

• Netis Systems NC63: through 3.0.0.3327

References

• https://github.com/ozcanpng/CVE-2026-76070
• https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/
• https://www.netis-systems.com/products/NC63.html
• https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameter

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