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Vulnerability · Published Nov 4, 2026 · Assigned by VulDB

CVE-2026-121606Qihoo 360 D621-2/D603-2/D600-2/D619/D606-6/D706 Firmware Signature Verification iscm verify_sign signature verification

Critical 10.0

In plain English

A critical-severity insufficient verification of data authenticity in D600-2 from Qihoo 360. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)0.2%top 84.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
Qihoo 360 D621-2 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7
Qihoo 360 D603-2 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7
Qihoo 360 D600-2 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7
Qihoo 360 D619 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7
Qihoo 360 D606-6 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7
Qihoo 360 D706 6.4.06.4.16.4.26.4.36.4.46.4.56.4.66.4.7

Weakness: CWE-347, CWE-345 · Vector: 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

References