Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification
CVSS score
10.0
EPSS probability
—
Risk score
1.0
Published
3 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
A vulnerability exists in Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6, and D706 products up to version 6.4.9 within the Firmware Signature Verification component's verify_sign function. Manipulation of the sign argument leads to improper verification of cryptographic signatures. The attack can be launched remotely.
This vulnerability is critical because it involves cryptographic signature verification flaws that can be remotely exploited without authentication. An exploit has been disclosed to the public, and the vendor has not responded to early disclosures.
What should be done?
- Monitor vendor advisories from Qihoo 360 for official updates
- Review official vendor guidance since patch status is currently unknown
- Apply network-level restrictions to limit exposure of affected devices
Chain of evidence and sources
Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 ve D706 ürünleri 6.4.9 ve önceki sürümlerinde zafiyet barındırmaktadır.
fs2/bin/iscm dosyasındaki verify_sign fonksiyonu sign argümanının manipüle edilmesiyle kriptografik imzanın uygunsuz doğrulanmasına yol açmaktadır.
Zafiyete ilişkin istismar kamuoyuna açıklanmış olup üretici herhangi bir yanıt vermemiştir.
Show the technical text from the sources
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.
CVSS vector: 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
CWE: CWE-347, CWE-345
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-121606 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 10.0 | CVSS V4_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 | CVE CNA |
| 10.0 | CVSS V3_1 | 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 | CVE CNA |
| 10.0 | CVSS V3_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 | CVE CNA |
| 10.0 | CVSS V2_0 | — | AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:C | CVE CNA |
| 10.0 | CVSS V2 | — | AV:N/AC:L/Au:N/C:C/I:C/A:C | NVD |
| 10.0 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD |
| 9.3 | CVSS V40 | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121606 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121606 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
10.0 / 10Vulnerability Scoring Details
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:PYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
Similar Vulnerabilities
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