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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 NC63 固件 V3.0.0.3327 版本存在一个基于栈的缓冲区溢出漏洞。未认证的远程攻击者可通过向 /bin/netis.cgi 中的登录处理函数提交过大的 Base64 编码密码，覆盖保存的栈状态。攻击者可利用自定义 Base64 解码器在对固定大小栈缓冲区进行输出长度验证方面的缺失，实现远程代码执行，并获得 root 权限，因为 Boa Web 服务器以 root 权限运行 CGI 环境。

CVSS 9.8 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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

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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