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CVE-2026-111711— Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()

Quick assessment

Affected
Netcore NR256CN
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netcore NR256CN 固件版本 1.5.140116 及更早版本中，Boa Web 服务器的 函数存在一个认证前的栈溢出漏洞。该函数使用无边界限制的 调用，将 Basic 认证的用户名复制到 64 字节的栈缓冲区中。未经认证的攻击者可以向任何受保护的 路由发送长度超过 63 字节的用户名，从而导致主 Boa 进程崩溃，甚至可能实现代码执行。

CVSS 9.8 · Critical EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netcore NR256CN ≤ 1.5.140116 affected
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I. Basic Information for CVE-2026-111711

Vulnerability Information
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Vulnerability Title
Netcore NR256CN through 1.5.140116 Pre-Auth Stack Overflow via Boa user_ok()
Source: CVE Program / CVE List V5
Vulnerability Description
Netcore NR256CN through 1.5.140116 contains a pre-authentication stack overflow vulnerability in the Boa web server's user_ok() function, which copies Basic-auth usernames with unbounded strcpy() calls into 64-byte stack buffers. Unauthenticated attackers can send a username longer than 63 bytes to any protected /router/*.cgi route to crash the main Boa process or potentially execute code.
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
Netcore NR256CN 0 ~ 1.5.140116 -

II. Public POCs for CVE-2026-111711

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III. Intelligence Information for CVE-2026-111711

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Vendor Advisories for CVE-2026-111711 (1)

Proof of Concept for CVE-2026-111711 (1)

Same Patch Batch · Netcore · 2026-10-16 · 3 CVEs total

CVE-2026-111710 7.5 HIGH Netcore NR256CN through 1.5.140116 Boa Web Server NULL Pointer Dereference DoS
CVE-2026-111712 6.5 MEDIUM Netcore NR256CN through 1.5.140116 Authentication Bypass via CGI Path Prefix

IV. Related Vulnerabilities

Same product: NR256CN
Same vendor: Netcore
Same weakness: CWE-121

V. Comments for CVE-2026-111711

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