Firmware Signature Verification Vulnerability in Qihoo 360 Products
CVE-2026-121606

10CRITICAL

Key Information:

Vendor

Qihoo 360

Status
D621-2
D603-2
D600-2
D619
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121606?

A critical vulnerability exists in several Qihoo 360 devices due to the improper verification of cryptographic signatures within the Firmware Signature Verification component. This vulnerability is exploitable remotely, allowing attackers to manipulate the verification function and potentially compromise the integrity of the firmware. Public disclosure of this exploit raises significant security concerns, especially since the vendor has not responded to early communication regarding the issue.

Affected Version(s)

D600-2 6.4.0

D600-2 6.4.1

D600-2 6.4.2

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-2026-121606 - Proof of Concept

References

https://vuldb.com/vuln/430443
vdb-entrytechnical-description
https://vuldb.com/vuln/430443/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121606
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
.