CVE-2026-76070Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password Parameter
Updated under an hour ago ()
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It affects Netis Systems NC63. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Netis Systems NC63 netis_systems:nc63 (from the name) | through 3.0.0.3327 | CNA record |
References
- https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/technical-description, exploit
- https://github.com/ozcanpng/CVE-2026-76070technical-description, exploit
- https://www.netis-systems.com/products/NC63.htmlproduct
- https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameterthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.