Buffer Overflow Vulnerability in Tenda AC20 Router
CVE-2025-15356

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac20
Vendor
CVE Published:
30 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-15356?

A buffer overflow vulnerability exists in the Tenda AC20 router, specifically within the sscanf function of the /goform/PowerSaveSet interface. The flaw arises from improper handling of user-supplied input, particularly the 'powerSavingEn', 'time', 'powerSaveDelay', and 'ledCloseType' parameters. This vulnerability allows remote attackers to exploit the system, potentially leading to unauthorized access or control over the device. Due to the public disclosure of the exploit, users are advised to take immediate action by updating their devices to mitigate potential threats.

Affected Version(s)

AC20 16.03.08.0

AC20 16.03.08.1

AC20 16.03.08.2

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-2025-15356 - Proof of Concept

CVE-2025-15356 - Proof of Concept

References

https://vuldb.com/?id.338742
vdb-entrytechnical-description
https://vuldb.com/?ctiid.338742
signaturepermissions-required
https://vuldb.com/?submit.726360
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

xuanyu (VulDB User)
JSON
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CVE-2025-15356 : Buffer Overflow Vulnerability in Tenda AC20 Router