Buffer Overflow Vulnerability in Tenda O3 Product by Tenda
CVE-2025-12209

8.7HIGH

Key Information:

Vendor

Tenda
Status
O3
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12209?

A buffer overflow vulnerability exists in the Tenda O3 product, specifically in the SetValue/GetValue functions of the '/goform/setDhcpConfig' file. This vulnerability allows an attacker to manipulate the 'dhcpEn' argument, potentially leading to a stack-based buffer overflow. The flaw can be exploited remotely, putting devices running this version at risk. The issue has been disclosed publicly, which increases the urgency for users to apply appropriate security measures.

Affected Version(s)

O3 1.0.0.10(2478)

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-2025-12209 - Proof of Concept

References

https://vuldb.com/?id.329879
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329879
signaturepermissions-required
https://vuldb.com/?submit.673263
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

yhryhryhr_miemie (VulDB User)
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