Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

CVE-2026-124561— D-Link DIR-878 HNAP prog.cgi SetVLANSettings 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 固件版本 1.20B05 中发现了一个漏洞。该漏洞影响 HNAP Handler 组件中文件的函数。通过恶意操纵参数，可导致基于栈的缓冲区溢出。该攻击可远程发起，且利用方法已公开披露，可能被利用。此漏洞仅影响已不再由维护者提供支持的產品。

CVSS 7.5 · High Updated Nov 09, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Get alerts for future matching vulnerabilities Log in to subscribe

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

D-Link DIR-878 HNAP prog.cgi SetVLANSettings stack-based overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability was determined in D-Link DIR-878 1.20B05. This impacts the function SetVLANSettings of the file prog.cgi of the component HNAP Handler. Executing a manipulation of the argument VID can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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	1.20B05	`cpe:2.3:h:d-link:dir-878::::::::`

II. Public POCs for CVE-2026-124561

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-124561

请登录查看更多情报信息。

Vendor Pages for CVE-2026-124561 (1)

Smart Home, SMB and Enterprise solutions | D-Link product

Other References for CVE-2026-124561 (5)

https://github.com/Zimo-666/DIR-878-cves/tree/main/03-settriggeradic-vlan-stack-overflow broken-link exploit
https://vuldb.com/cve/CVE-2026-124561 third-party-advisory
https://vuldb.com/vuln/432893/cti signature permissions-required
https://vuldb.com/submit/1035617 third-party-advisory
https://vuldb.com/vuln/432893 vdb-entry technical-description

https://www.cve.org/CVERecord?id=CVE-2026-124561

Same Patch Batch · D-Link · 2026-11-09 · 5 CVEs total

CVE-2026-124560	9.8 CRITICAL	D-Link DIR-878 HNAP prog.cgi GetCAPTCHAsetting heap-based overflow
CVE-2026-124563	7.5 HIGH	D-Link DIR-878 HNAP SetWanSettings buffer overflow
CVE-2026-124562	7.5 HIGH	D-Link DIR-878 HNAP SetWanSettings buffer overflow
CVE-2026-124564	5.3 MEDIUM	D-Link DIR-878 HNAP prog.cgi GetListDirectory path traversal

IV. Related Vulnerabilities

Same product: DIR-878

Same vendor: D-Link

Same weakness: CWE-121