by Kastro
Paper/Archive/CVE-2026-76070

CVE-2026-76070

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

EPSS 1%public exploitCVSS 9.8
critical.is priorityof 100
54
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 71.3.713 × 2014.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
NC63≤ 3.0.0.3327–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflowexploitgithub.com/ozcanpng/CVE-2026-76070refnetis-systems.com/products/NC63.htmlwriteupvulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameter