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CVE-2026-76071— Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter

Quick assessment

Affected
Netis Systems NC63
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netis NC63 固件 V3.0.0.3327 及更早版本存在栈缓冲区溢出漏洞，该漏洞允许未经身份验证的远程攻击者通过向 netis.cgi 中的 ipFilterList=mod 动作提供超长的 destHost 参数，从而覆盖已保存的栈状态。攻击者可以利用宽度不限的 sscanf 转换，在验证身份之前将用户提供的输入复制到固定大小的栈缓冲区中，从而在具有 root 权限的 Boa Web 服务器执行 CGI 环境时，实现以 root 身份进行的远程代码执行。

CVSS 9.8 · Critical EPSS 1.06% · P62

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netis Systems NC63 ≤ 3.0.0.3327 affected
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I. Basic Information for CVE-2026-76071

Vulnerability Information
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Vulnerability Title
Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter
Source: CVE Program / CVE List V5
Vulnerability 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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netis Systems NC63 0 ~ 3.0.0.3327 -

II. Public POCs for CVE-2026-76071

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10350 chars
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III. Intelligence Information for CVE-2026-76071

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Vendor Advisories for CVE-2026-76071 (1)

Exploits & Public PoCs for CVE-2026-76071 (1)

Security Blog Posts for CVE-2026-76071 (1)

Vendor Pages for CVE-2026-76071 (1)

IV. Related Vulnerabilities

Same product: NC63
Same vendor: Netis Systems
Same weakness: CWE-121

V. Comments for CVE-2026-76071

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