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.

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

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