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CVE-2026-121606

Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification

  • Critical 10.0
  • A public exploit reference is listed

Description

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.

Key facts

Published
4 Nov 2026
Last changed
9 Nov 2026
Assigned by
VulDB
EPSS
0.24% likely to be exploited in the next 30 days, higher than 15.164% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: poc; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 10.0CVSS 4.0, Criticalfrom the CNA (VulDB)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
  • 10.0CVSS 3.1, Criticalfrom the CNA (VulDB)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
  • 10.0CVSS 3.0, Criticalfrom the CNA (VulDB)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
  • 10.0CVSS 2.0, Highfrom the CNA (VulDB)AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:C

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Qihoo 360D621-2
  • 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)
Qihoo 360D603-2
  • 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)
Qihoo 360D600-2
  • 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)
Qihoo 360D619
  • 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)
Qihoo 360D606-6
  • 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)
Qihoo 360D706
  • 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)

Timeline

  1. 3 Nov 2026 Advisory disclosed
  2. 3 Nov 2026 VulDB entry created
  3. 3 Nov 2026 VulDB entry last update
  4. 4 Nov 2026 Published

Weakness

References