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TI-2026-84911 Aliases CVE-2026-121606GHSA-4g7h-mgvw-cqjw

Improper signature verification in Qihoo 360 firmware iscm

Priority MEDIUM 42CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 and D706 firmware versions 6.4.0 through 6.4.9 are affected. The verify_sign function in fs2/bin/iscm does not properly verify cryptographic signatures when the sign argument is manipulated (CWE-347). A remote attacker without privileges or user interaction can exploit this, and the exploit has been publicly disclosed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

EPSS 0.0024 15th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Qihoo 360D621-26.4.0; 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—No fix listedCNA
Qihoo 360D603-26.4.0; 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—No fix listedCNA
Qihoo 360D600-26.4.0; 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—No fix listedCNA
Qihoo 360D6196.4.0; 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—No fix listedCNA
Qihoo 360D606-66.4.0; 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—No fix listedCNA
Qihoo 360D7066.4.0; 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—No fix listedCNA
  • D621-2 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA
  • D603-2 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA
  • D600-2 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA
  • D619 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA
  • D606-6 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA
  • D706 VendorQihoo 360 Affected 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 Fixed in — No fix listed CNA

CPE names CNA · 6

CPEVersionsRoleVendor
cpe:2.3:a:qihoo_360:d621-2:*:*:*:*:*:*:*:*——Qihoo 360
cpe:2.3:a:qihoo_360:d603-2:*:*:*:*:*:*:*:*——Qihoo 360
cpe:2.3:a:qihoo_360:d600-2:*:*:*:*:*:*:*:*——Qihoo 360
cpe:2.3:a:qihoo_360:d619:*:*:*:*:*:*:*:*——Qihoo 360
cpe:2.3:a:qihoo_360:d606-6:*:*:*:*:*:*:*:*——Qihoo 360
cpe:2.3:a:qihoo_360:d706:*:*:*:*:*:*:*:*——Qihoo 360
  • cpe:2.3:a:qihoo_360:d621-2:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360
  • cpe:2.3:a:qihoo_360:d603-2:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360
  • cpe:2.3:a:qihoo_360:d600-2:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360
  • cpe:2.3:a:qihoo_360:d619:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360
  • cpe:2.3:a:qihoo_360:d606-6:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360
  • cpe:2.3:a:qihoo_360:d706:*:*:*:*:*:*:*:* Versions — — ·Qihoo 360

Remediation

The sources list no fixed version for Qihoo 360 D621-2, D603-2, D600-2, D619, D606-6 and D706.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Timeline

  1. 2026-11-04 Threatist record created from CVE-2026-121606
  2. 2026-11-04 Alias added: GHSA-4g7h-mgvw-cqjw

References

Exploit 1

  • TI-2026-84912 OS command injection in Qihoo 360 D603-2 and other models CVSS 4.0CRITICAL 10.0
  • TI-2026-84914 Hard-coded credentials in Qihoo 360 Whole Home Router M5 boot script CVSS 4.0CRITICAL 10.0
  • TI-2026-84913 OS command injection in Qihoo 360 D603-2 timezone push handler CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences