CVE-2026-76070
Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Reserved
- Aug 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-121 Stack-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
NC63Netis Systems |
|
References
- Researcher Blogtechnical-descriptionexploit
- Researcher GitHub Repotechnical-descriptionexploit
- Product Pageproduct
- https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameterthird-party-advisory
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