Buffer Overflow Vulnerability in Tenda AC20 by Tenda
CVE-2025-14656

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac20
Vendor
CVE Published:
14 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-14656?

A vulnerability has been discovered in the Tenda AC20 router, specifically affecting the httpd function in the openSchedWifi endpoint. By manipulating the parameters schedStartTime or schedEndTime, an attacker can trigger a buffer overflow, leading to potential unauthorized access or execution of malicious code. This vulnerability can be exploited remotely, making it particularly concerning. Publicly available exploits increase the urgency for users to address this issue. It is crucial for users to implement security measures to mitigate this risk.

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-2025-14656 - Proof of Concept

References

https://vuldb.com/?id.336389
vdb-entrytechnical-description
https://vuldb.com/?ctiid.336389
signaturepermissions-required
https://vuldb.com/?submit.712917
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

jiahui2888 (VulDB User)
JSON
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CVE-2025-14656 : Buffer Overflow Vulnerability in Tenda AC20 by Tenda