Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.3epss 1.0%
exploitation probability
1.0%top 40% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
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-2026-76070★ 1cve_referenceozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.