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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 Systems NC63是Netis Systems公司的一款网络威胁情报分析产品。 Netis Systems NC63 3.0.0.3327及之前版本存在缓冲区错误漏洞，该漏洞源于netis.cgi中ipFilterList=mod操作对destHost参数处理不当，存在栈缓冲区溢出，攻击者可在身份验证前利用无宽度sscanf转换将用户输入复制到固定大小栈缓冲区，覆盖保存的栈状态，可能导致未经身份验证的远程攻击者以root权限执行任意代码。

CVSS 9.8 · Critical EPSS 1.42% · P72

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
Vulnerability Title
Netis Systems NC63 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netis Systems NC63是Netis Systems公司的一款网络威胁情报分析产品。 Netis Systems NC63 3.0.0.3327及之前版本存在缓冲区错误漏洞，该漏洞源于netis.cgi中ipFilterList=mod操作对destHost参数处理不当，存在栈缓冲区溢出，攻击者可在身份验证前利用无宽度sscanf转换将用户输入复制到固定大小栈缓冲区，覆盖保存的栈状态，可能导致未经身份验证的远程攻击者以root权限执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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