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CVE-2026-3678— Tenda FH451 AdvSetWan sub_3C434 stack-based overflow

Quick assessment

Affected
Tenda FH451
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.

Tenda FH451是中国腾达（Tenda）公司的一款路由器。 Tenda FH451 1.0.0.9版本存在安全漏洞，该漏洞源于对文件/goform/AdvSetWan中参数wanmode/PPPOEPassword的错误操作，可能导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-3678

Vulnerability Information
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Vulnerability Title
Tenda FH451 AdvSetWan sub_3C434 stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Tenda FH451 1.0.0.9. Affected is the function sub_3C434 of the file /goform/AdvSetWan. This manipulation of the argument wanmode/PPPOEPassword causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Tenda FH451 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda FH451是中国腾达（Tenda）公司的一款路由器。 Tenda FH451 1.0.0.9版本存在安全漏洞，该漏洞源于对文件/goform/AdvSetWan中参数wanmode/PPPOEPassword的错误操作，可能导致栈缓冲区溢出。
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
Tenda FH451 1.0.0.9 cpe:2.3:o:tenda:fh451_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3678

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8745 chars
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III. Intelligence Information for CVE-2026-3678

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Vendor Advisories for CVE-2026-3678 (2)

Other References for CVE-2026-3678 (1)

Same Patch Batch · Tenda · 2026-03-07 · 3 CVEs total

CVE-2026-3677 8.8 HIGH Tenda FH451 setcfm fromSetCfm stack-based overflow
CVE-2026-3679 8.8 HIGH Tenda FH451 QuickIndex formQuickIndex stack-based overflow

IV. Related Vulnerabilities

Same product: FH451
Same vendor: Tenda
Same weakness: CWE-121

V. Comments for CVE-2026-3678

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