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CVE-2026-90693— D-Link DIR-878 WAN Settings SetWan3Settings stack-based overflow

Quick assessment

Affected
D-Link DIR-878
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.

在 D-Link DIR-878 120B05 中发现了一个漏洞。该漏洞影响 WAN 设置组件中的 SetWan3Settings 函数。通过操纵主/备（Primary/Secondary）参数，可导致基于栈的缓冲区溢出。此漏洞可被远程利用。

CVSS 9.9 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-90693

Vulnerability Information
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Vulnerability Title
D-Link DIR-878 WAN Settings SetWan3Settings stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in D-Link DIR-878 120B05. This impacts the function SetWan3Settings of the component WAN Settings. This manipulation of the argument Primary/Secondary causes stack-based buffer overflow. Remote exploitation of the attack is possible.
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 DIR-878 120B05 cpe:2.3:h:d-link:dir-878:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-90693

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III. Intelligence Information for CVE-2026-90693

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Proof of Concept for CVE-2026-90693 (1)

Vendor Pages for CVE-2026-90693 (1)

Same Patch Batch · D-Link · 2026-09-14 · 9 CVEs total

CVE-2026-90699 9.9 CRITICAL D-Link DWR-M920 formPinManageSetup sub_41E60C os command injection
CVE-2026-90692 9.9 CRITICAL D-Link DIR-878 Dynamic DNS IPv6 Settings SetDynamicDNSIPv6Settings stack-based overflow
CVE-2026-90680 9.9 CRITICAL D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow
CVE-2026-90703 9.1 CRITICAL D-Link DWR-M921 formDiskCreateShare system os command injection
CVE-2026-90702 9.1 CRITICAL D-Link DWR-M921 formDiskFormat system os command injection
CVE-2026-90706 6.6 MEDIUM D-Link DWR-M921 formWsc os command injection
CVE-2026-90705 6.6 MEDIUM D-Link DWR-M921 Boa Dispatch Table formsysCmd os command injection
CVE-2026-90704 6.6 MEDIUM D-Link DWR-M921 formDiskPartition system command injection

IV. Related Vulnerabilities

Same product: DIR-878
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-90693

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