CVE-2026-76071 json
Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter
published 2026-08-24 2 mo ago modified 2026-10-12 27 d ago also EUVD-2026-64922
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
1.42% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- ozcanpng.dev https://ozcanpng.dev/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/ referenced PoC, tagged "exploit" by a source, unverified
- github.com https://github.com/ozcanpng/CVE-2026-76071 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- Netis Systems NC63
Classification
- Weakness
-
- CWE-121 Stack-based Buffer Overflow
References
-
ozcanpng.dev
/blog/cve-2026-76071-netis-nc63-ipfilter-stack-buffer-overflow/
technical-description, exploit
-
github.com
/ozcanpng/CVE-2026-76071
technical-description, exploit
-
netis-systems.com
/products/NC63.html
product
-
vulncheck.com
/advisories/netis-nc63-stack-buffer-overflow-via-desthost-parameter
third-party-advisory
Sources
- CVE List CVE-2026-76071
- NVD CVE-2026-76071
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