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CVE-2026-91001— D-Link DI-8400 DDNS Configuration ddns.asp ddns_asp stack-based overflow

Quick assessment

Affected
D-Link DI-8400
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.

D-Link DI-8400 16.07 中存在一个安全缺陷。该缺陷影响 DDNS 配置组件中 /ddns.asp 文件的 ddns_asp 函数。对 serv/user/host/wild/mx/bmx/cust/ip 参数的操纵会导致基于栈的缓冲区溢出。攻击可以远程发起。该漏洞的利用代码已公开，可被用于发动攻击。

CVSS 9.9 · Critical
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I. Basic Information for CVE-2026-91001

Vulnerability Information
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Vulnerability Title
D-Link DI-8400 DDNS Configuration ddns.asp ddns_asp stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in D-Link DI-8400 16.07. This affects the function ddns_asp of the file /ddns.asp of the component DDNS Configuration. Performing a manipulation of the argument serv/user/host/wild/mx/bmx/cust/ip results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
D-Link DI-8400 16.07 cpe:2.3:h:d-link:di-8400:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-91001

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III. Intelligence Information for CVE-2026-91001

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Proof of Concept for CVE-2026-91001 (2)

Vendor Pages for CVE-2026-91001 (1)

Same Patch Batch · D-Link · 2026-09-15 · 4 CVEs total

CVE-2026-91003 9.1 CRITICAL D-Link DI-8300 CGI Service rzgl.asp rzgl_asp stack-based overflow
CVE-2026-90880 7.4 HIGH D-Link DSL-3782 Diagnostics Diagnostics.asp system command injection
CVE-2026-90881 5.3 MEDIUM D-Link DIR-882 CGI Binary dllog.cgi main information disclosure

IV. Related Vulnerabilities

Same product: DI-8400
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-91001

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