CVE-2026-121606
CriticalCVSS 10.0Summary
A vulnerability was found in Qihoo 360 devices (models D621-2, D603-2, D600-2, D619, D606-6 and D706 up to 6.4.9) in the verify_sign function of fs2/bin/iscm responsible for firmware signature verification. Manipulating the sign argument leads to improper verification of cryptographic signatures. The attack can be launched remotely and the exploit has been publicly disclosed.
Risk Assessment
Improper firmware signature verification may allow an attacker to upload crafted firmware, potentially leading to full device compromise. Public availability of the exploit increases the risk of abuse.
Recommendation
Contact the vendor for a patch and, until then, restrict remote access to the device management interface. Monitor devices for unauthorized firmware changes.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

