Buffer Overflow Vulnerability in Tenda M3 Router
CVE-2026-5567

8.7HIGH

Key Information:

Vendor

Tenda
Status
M3
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5567?

A security flaw has been identified in the Tenda M3 router, specifically within the setAdvPolicyData function of the Destination Handler component. This vulnerability can result in a buffer overflow due to improper handling of the policyType argument. Attackers can exploit this weakness remotely, which raises significant security concerns. It is essential for users to be aware of this vulnerability and take appropriate measures to secure their devices.

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Affected Version(s)

M3 1.0.0.10

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-2026-5567 - Proof of Concept

References

https://vuldb.com/vuln/355337
vdb-entrytechnical-description
https://vuldb.com/vuln/355337/cti
signaturepermissions-required
https://vuldb.com/submit/782999
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

Doma (VulDB User)
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