CVE-2026-121606— Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification
Quick assessment
Affected
Qihoo 360 D621-2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
奇虎 360 的 D621-2、D603-2、D600-2、D619、D606-6 和 D706 设备（固件版本 6.4.9 及以下）中发现一处漏洞。该问题影响固件签名验证组件中 文件内的 函数。通过对 参数进行恶意篡改，可导致密码学签名验证失效。该攻击可远程发起，利用方法已向公众披露，可能被实际利用。漏洞披露初期已联系厂商，但厂商未作出任何回应。
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I. Basic Information for CVE-2026-121606
Vulnerability Information
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Vulnerability Title
Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Qihoo 360 | D621-2 | 6.4.0 |
cpe:2.3:a:qihoo_360:d621-2:*:*:*:*:*:*:*:*
|
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| Qihoo 360 | D603-2 | 6.4.0 |
cpe:2.3:a:qihoo_360:d603-2:*:*:*:*:*:*:*:*
|
|
| Qihoo 360 | D600-2 | 6.4.0 |
cpe:2.3:a:qihoo_360:d600-2:*:*:*:*:*:*:*:*
|
|
| Qihoo 360 | D619 | 6.4.0 |
cpe:2.3:a:qihoo_360:d619:*:*:*:*:*:*:*:*
|
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| Qihoo 360 | D606-6 | 6.4.0 |
cpe:2.3:a:qihoo_360:d606-6:*:*:*:*:*:*:*:*
|
|
| Qihoo 360 | D706 | 6.4.0 |
cpe:2.3:a:qihoo_360:d706:*:*:*:*:*:*:*:*
|
|
II. Public POCs for CVE-2026-121606
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-121606 (5)
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https://vuldb.com/cve/CVE-2026-121606 third-party-advisory
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https://vuldb.com/submit/1023261 third-party-advisory
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Same Patch Batch · Qihoo 360 · 2026-11-04 · 4 CVEs total
| CVE-2026-121607 | 10.0 CRITICAL | Qihoo 360 D603-2/D600-2/D606-6/D706 iscm testspeed_command os command injection |
| CVE-2026-121609 | 10.0 CRITICAL | Qihoo 360 Whole Home Router M5 Boot Script mpt start hard-coded credentials |
| CVE-2026-121608 | 7.3 HIGH | Qihoo 360 D603-2/D600-2/D606-6 Timezone Push iscm on_push_message os command injection |