Stack-Based Buffer Overflow in Tenda FH451 by Tenda
CVE-2026-3677

8.7HIGH

Key Information:

Vendor

Tenda
Status
Fh451
Vendor
CVE Published:
7 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3677?

A stack-based buffer overflow vulnerability has been identified in the Tenda FH451 router firmware version 1.0.0.9. This issue arises in the 'fromSetCfm' function within the '/goform/setcfm' file due to improper handling of the 'funcname' and 'funcpara1' arguments. An attacker could exploit this vulnerability remotely, potentially leading to arbitrary code execution and compromising the device's security. The exploit has been publicly disclosed, making it crucial for users to assess the risks and update their devices accordingly.

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-2026-3677 - Proof of Concept

References

https://vuldb.com/?id.349579
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349579
signaturepermissions-required
https://vuldb.com/?submit.765329
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)
.