Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 up to 6.4.9 Firmware Signature Verification fs2/bin/iscm verify_sign signature verification

Summaryinfo

A vulnerability classified as very critical has been found in Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 and D706 up to 6.4.9. This affects the function verify_sign of the file fs2/bin/iscm of the component Firmware Signature Verification. Performing a manipulation of the argument sign results in signature verification. This vulnerability was named CVE-2026-121606. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability classified as very critical has been found in Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 and D706 up to 6.4.9. This affects the function verify_sign of the file fs2/bin/iscm of the component Firmware Signature Verification. The manipulation of the argument sign with an unknown input leads to a signature verification vulnerability. CWE is classifying the issue as CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. This is going to have an impact on confidentiality, integrity, and availability.

It is possible to read the advisory at gist.github.com. This vulnerability is uniquely identified as CVE-2026-121606. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/03/2026).

The exploit is shared for download at gist.github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Qihoo 360

Name

• D600-2
• D603-2
• D606-6
• D619
• D621-2
• D706

Version

• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.4.4
• 6.4.5
• 6.4.6
• 6.4.7
• 6.4.8
• 6.4.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Exploitinginfo

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Entryinfo

Submitinfo

Accepted

• Submit #1023261: 360 (Qihoo 360) 360 Smart Camera (IPC) 6.0.24 ~ 6.4.9 Improper Verification of Cryptographic Signature (by xiaomao)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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