Stack-based Buffer Overflow in Tenda F451 Router Firmware
CVE-2026-5991

8.7HIGH

Key Information:

Vendor

Tenda
Status
F451
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5991?

A stack-based buffer overflow vulnerability has been identified in the Tenda F451 router's firmware version 1.0.0.7, specifically in the function formWrlExtraSet located at /goform/WrlExtraSet. This vulnerability arises from improper handling of the argument GO, which could enable an attacker to execute arbitrary code remotely. The exploit has been made public, increasing the risk of potential attacks. Users are advised to take immediate action to secure their devices.

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-2026-5991 - Proof of Concept

References

https://vuldb.com/vuln/356545
vdb-entrytechnical-description
https://vuldb.com/vuln/356545/cti
signaturepermissions-required
https://vuldb.com/submit/792862
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)
.