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CVE-2026-76070— Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password 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 V3.0.0.3327及之前版本存在缓冲区错误漏洞，该漏洞源于/bin/netis.cgi登录处理程序对提交的超大Base64编码密码缺乏输出长度验证，导致栈缓冲区溢出，可能允许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 1.34% · P70

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netis Systems NC63 ≤ 3.0.0.3327 affected
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I. Basic Information for CVE-2026-76070

Vulnerability Information
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Vulnerability Title
Netis NC63 V3.0.0.3327 Stack Buffer Overflow via Login Password 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 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.
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 V3.0.0.3327及之前版本存在缓冲区错误漏洞，该漏洞源于/bin/netis.cgi登录处理程序对提交的超大Base64编码密码缺乏输出长度验证，导致栈缓冲区溢出，可能允许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-2026-76070

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10548 chars
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III. Intelligence Information for CVE-2026-76070

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Vendor Advisories for CVE-2026-76070 (1)

Exploits & Public PoCs for CVE-2026-76070 (1)

Security Blog Posts for CVE-2026-76070 (1)

Vendor Pages for CVE-2026-76070 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-76070

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