Stack-Based Buffer Overflow in Tenda F451 Router
CVE-2026-6121

8.7HIGH

Key Information:

Vendor

Tenda
Status
F451
Vendor
CVE Published:
12 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6121?

A flaw exists in the Tenda F451 router, specifically in the WrlclientSet function of the /goform/WrlclientSet file associated with the httpd component. This vulnerability allows an attacker to manipulate the GO argument, potentially leading to a stack-based buffer overflow. The nature of this flaw means that the exploit can be initiated remotely, posing a significant security risk to users of this router. Security measures should be implemented to guard against potential attacks utilizing this vulnerability.

Affected Version(s)

F451 1.0.0.7

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-2026-6121 - Proof of Concept

References

https://vuldb.com/vuln/356984
vdb-entrytechnical-description
https://vuldb.com/vuln/356984/cti
signaturepermissions-required
https://vuldb.com/submit/792865
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

Jimi (VulDB User)
.