Stack-based Buffer Overflow in Tenda O3V2 Product
CVE-2025-7421

8.7HIGH

Key Information:

Vendor

Tenda
Status
O3v2
Vendor
CVE Published:
11 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-7421?

A stack-based buffer overflow vulnerability exists in the MacFilterModify function of the Tenda O3V2's httpd component. By manipulating the 'mac' argument in the /goform/operateMacFilter file, an attacker may exploit this flaw remotely, potentially compromising the device's operation. Public disclosure of this exploit raises significant concerns for users of this product.

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Affected Version(s)

O3V2 1.0.0.12(3880)

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-2025-7421 - Proof of Concept

References

https://vuldb.com/?id.315881
vdb-entrytechnical-description
https://vuldb.com/?ctiid.315881
signaturepermissions-required
https://vuldb.com/?submit.608867
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

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