Remote Code Execution Vulnerability in Qihoo 360 Whole Home Router M5
CVE-2026-121609

10CRITICAL

Key Information:

Vendor

Qihoo 360

Status
Whole Home Router M5
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121609?

A vulnerability in the Qihoo 360 Whole Home Router M5 affects the boot script, exposing hard-coded credentials. This flaw enables remote exploitation, potentially allowing unauthorized access to the router's functionalities. The vendor, Qihoo 360, was notified but has not addressed the issue publicly, enhancing the risk of exploitation since proofs of concept are readily available online.

Affected Version(s)

Whole Home Router M5 4.0.17.1566

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-2026-121609 - Proof of Concept

References

https://vuldb.com/vuln/430446
vdb-entrytechnical-description
https://vuldb.com/vuln/430446/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121609
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
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

xiaomao (VulDB User)
VulDB CNA Team
.