Stack-based Buffer Overflow in Tenda FH451 by Tenda
CVE-2026-3678

8.7HIGH

Key Information:

Vendor

Tenda
Status
Fh451
Vendor
CVE Published:
7 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3678?

A vulnerability exists in the Tenda FH451 router, specifically in the function sub_3C434 found in /goform/AdvSetWan. This issue stems from improper handling of the wanmode/PPPOEPassword argument, resulting in a stack-based buffer overflow. An attacker could potentially exploit this vulnerability remotely, leading to unauthorized access and control over the affected device. Mitigation is crucial as the exploit has been publicly disclosed, heightening the risk for users of this product.

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Affected Version(s)

FH451 1.0.0.9

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3678 - Proof of Concept

References

https://vuldb.com/?id.349580
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349580
signaturepermissions-required
https://vuldb.com/?submit.765330
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHuster (VulDB User)
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