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CVE-2026-7851— D-Link DI-8100 yyxz.asp sprintf stack-based overflow

Quick assessment

Affected
D-Link DI-8100
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.

D-Link DI-8100是中国友讯（D-Link）公司的一款专为中小型网络环境设计的无线宽带路由器。 D-Link DI-8100 16.07.26A1版本存在缓冲区错误漏洞，该漏洞源于文件yyxz.asp中函数sprintf对参数ID的操作导致栈缓冲区溢出，可能导致远程攻击。

CVSS 7.2 · High EPSS 1.24% · P68

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
D-Link DI-8100 16.07.26A1 affected
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I. Basic Information for CVE-2026-7851

Vulnerability Information
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Vulnerability Title
D-Link DI-8100 yyxz.asp sprintf stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in D-Link DI-8100 16.07.26A1. This affects the function sprintf of the file yyxz.asp. The manipulation of the argument ID leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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
D-Link DI-8100 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DI-8100是中国友讯（D-Link）公司的一款专为中小型网络环境设计的无线宽带路由器。 D-Link DI-8100 16.07.26A1版本存在缓冲区错误漏洞，该漏洞源于文件yyxz.asp中函数sprintf对参数ID的操作导致栈缓冲区溢出，可能导致远程攻击。
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
D-Link DI-8100 16.07.26A1 -

II. Public POCs for CVE-2026-7851

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7629 chars
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III. Intelligence Information for CVE-2026-7851

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News Coverage for CVE-2026-7851 (1)

Vendor Pages for CVE-2026-7851 (1)

Same Patch Batch · D-Link · 2026-05-05 · 6 CVEs total

CVE-2026-7854 9.8 CRITICAL D-Link DI-8100 POST Parameter url_rule.asp url_rule_asp buffer overflow
CVE-2026-7853 9.8 CRITICAL D-Link DI-8100 HTTP auto_reboot.asp sprintf buffer overflow
CVE-2026-7855 8.8 HIGH D-Link DI-8100 HTTP Request tggl.asp tggl_asp buffer overflow
CVE-2026-7857 7.2 HIGH D-Link DI-8100 CGI user_group.asp sprintf buffer overflow
CVE-2026-7856 7.2 HIGH D-Link DI-8100 Web Management url_member.asp buffer overflow

IV. Related Vulnerabilities

Same product: DI-8100
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-7851

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