Buffer Overflow in Tenda F456 Router from Tenda
CVE-2026-9389

8.7HIGH

Key Information:

Vendor

Tenda
Status
F456
Vendor
CVE Published:
24 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9389?

A security vulnerability exists in the Tenda F456 router version 1.0.0.5, specifically impacting the frmL7ImForm function of the /goform/L7Im file. This issue arises from improper handling of the 'page' argument, which can lead to a buffer overflow. Remote attackers can exploit this flaw to manipulate the affected function, potentially compromising the device's security. The vulnerability has been made public, raising concerns regarding its potential exploitation.

Affected Version(s)

F456 1.0.0.5

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-2026-9389 - Proof of Concept

References

https://vuldb.com/vuln/365352
vdb-entrytechnical-description
https://vuldb.com/vuln/365352/cti
signaturepermissions-required
https://vuldb.com/submit/813444
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

LtzHust (VulDB User)
.