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Vulnerabilities CVE-2026-76070

CVE-2026-76070

Critical
Open
TLP:CLEAR

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter

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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.

Details

CVSS Score
9.3
CVSS Vector
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
Confidence
90%
Published
Aug 24, 2026
Last Modified
Aug 24, 2026
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