Stack-based Buffer Overflow in Tenda AC20 Router Firmware
CVE-2025-9046

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac20
Vendor
CVE Published:
15 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9046?

A stack-based buffer overflow vulnerability has been identified in the Tenda AC20 router firmware version 16.03.08.12. The flaw resides in the function sub_46A2AC in the /goform/setMacFilterCfg file, where improper handling of input parameters can lead to potential remote exploitation. Attackers can leverage this vulnerability to execute arbitrary code, compromising the integrity and confidentiality of the device. Given the public disclosure of the exploit, it is crucial for users to take immediate action to safeguard their devices.

Affected Version(s)

AC20 16.03.08.12

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-2025-9046 - Proof of Concept

References

https://vuldb.com/?id.320267
vdb-entrytechnical-description
https://vuldb.com/?ctiid.320267
signaturepermissions-required
https://vuldb.com/?submit.631932
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

n0ps1ed (VulDB User)
.
CVE-2025-9046 : Stack-based Buffer Overflow in Tenda AC20 Router Firmware