Stack-Based Buffer Overflow in Tenda F456 Router
CVE-2026-6199

8.7HIGH

Key Information:

Vendor

Tenda
Status
F456
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6199?

A stack-based buffer overflow vulnerability has been identified in the Tenda F456 router, specifically within the 'fromqossetting' function of the /goform/qossetting file. This vulnerability allows for remote exploitation, where an attacker can manipulate the 'page' argument, potentially leading to unauthorized access and control over the affected system. The exploit is publicly available, which raises significant security concerns for users running version 1.0.0.5 of the Tenda F456 router.

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-2026-6199 - Proof of Concept

References

https://vuldb.com/vuln/357121
vdb-entrytechnical-description
https://vuldb.com/vuln/357121/cti
signaturepermissions-required
https://vuldb.com/submit/797471
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)
.