CVE-2026-76071Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost 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 supplying an oversized destHost parameter to the ipFilterList=mod action in netis.cgi. Attackers can exploit widthless sscanf conversions that copy user-supplied input into fixed-size stack buffers before authentication is verified, achieving remote code execution as root due to the Boa web server executing the CGI environment with root privileges.
- 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 26, 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-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/technical-description, exploit
- https://github.com/ozcanpng/CVE-2026-76071technical-description, exploit
- https://www.netis-systems.com/products/NC63.htmlproduct
- https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-desthost-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.