Stack-based Buffer Overflow in Tenda AC5 Routers
CVE-2026-4906

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac5
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4906?

A stack-based buffer overflow vulnerability exists within the Tenda AC5 router, specifically in the 'decodePwd' function of the '/goform/WizardHandle' component. This security flaw allows attackers to manipulate the 'WANT/WANS' argument via a crafted POST request, potentially enabling remote code execution. The vulnerability has been publicly disclosed and poses risks to users of the affected router model due to its exploitability.

Affected Version(s)

AC5 15.03.06.47

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-2026-4906 - Proof of Concept

References

https://vuldb.com/?id.353657
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353657
signaturepermissions-required
https://vuldb.com/?submit.777394
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

wxhwxhwxh_mie (VulDB User)
.