CVE-2026-121606
Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification
A vulnerability has been found in Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 and D706 up to 6.4.9. Affected by this issue is the function verify_sign of the file fs2/bin/iscm of the component Firmware Signature Verification. Such manipulation of the argument sign leads to improper verification of cryptographic signature. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| D621-2 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
| D603-2 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
| D600-2 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
| D619 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
| D606-6 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
| D706 Qihoo 360 |
6.4.0 (affected) 6.4.1 (affected) 6.4.2 (affected) 6.4.3 (affected) 6.4.4 (affected) 6.4.5 (affected) 6.4.6 (affected) 6.4.7 (affected) 6.4.8 (affected) 6.4.9 (affected) |
CNA: VulDB |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 10.0 critical |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P | CNA: VulDB |
| 3.1 / 10.0 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C | CNA: VulDB |
| 3.0 / 10.0 critical |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C | CNA: VulDB |
| 2.0 / 10.0 critical |
AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:C | CNA: VulDB |
Exploit evidence
- https://gist.github.com/gajgdm6-cpu/cf98af20ddb77f27a7c112214a6280f7
exploit · CNA: VulDB
References
- https://vuldb.com/vuln/430443CNA: VulDB · vdb-entry, technical-description
- https://vuldb.com/vuln/430443/ctiCNA: VulDB · signature, permissions-required
- https://vuldb.com/cve/CVE-2026-121606CNA: VulDB · third-party-advisory
- https://vuldb.com/submit/1023261CNA: VulDB · third-party-advisory
- https://gist.github.com/gajgdm6-cpu/cf98af20ddb77f27a7c112214a6280f7CNA: VulDB · exploit
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.