CVE-2026-121606

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

Products / packages Qihoo 360 D621-2 · Qihoo 360 D603-2 · Qihoo 360 D600-2 · 3 more

Published 04/11/2026, 01:00:26 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 05/11/2026, 02:20:32 UTC

VulDB · CVSS:4.0 · 10

Assessment vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

VulDB · CVSS:3.1 · 10

Assessment 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

VulDB · CVSS:3.0 · 10

Assessment vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C

VulDB · CVSS 2 / source score · 10

Assessment vector

AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:C

The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

critical10.0

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Exploit reference published

Source-linked evidence; not proof of attacks in the wild or independent validation.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

Qihoo 360 devices D621-2, D603-2, D600-2, D619, D606-6, and D706 up to version 6.4.9 have a vulnerability in the verify_sign function, allowing improper verification of cryptographic signatures. The attack can be launched remotely.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Qihoo 360 · VulDB

D621-2

10 ranges

VulDB version evidence

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Compare with this publisher’s ranges. This does not inspect your installation.

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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d621-2:*:*:*:*:*:*:*:*

Qihoo 360 · VulDB

D603-2

10 ranges

VulDB version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d603-2:*:*:*:*:*:*:*:*

Qihoo 360 · VulDB

D600-2

10 ranges

VulDB version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d600-2:*:*:*:*:*:*:*:*

Qihoo 360 · VulDB

D619

10 ranges

VulDB version evidence

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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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d619:*:*:*:*:*:*:*:*

Qihoo 360 · VulDB

D606-6

10 ranges

VulDB version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d606-6:*:*:*:*:*:*:*:*

Qihoo 360 · VulDB

D706

10 ranges

VulDB version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

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

Other versions: unknown

Product identifiers (CPE)

cpe:2.3:a:qihoo_360:d706:*:*:*:*:*:*:*:*

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

The sources identify public exploit references. We have not independently tested them; their availability does not establish exploitation in the wild.

gist.github.com/gajgdm6-cpu/cf98af20ddb77f27a7c112214a6280f7 ↗Attributed to VulDB

Original source description

Read the full publisher 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.

References

5 sources

VulDB · advisory #430443

Security advisoryVulDB

VulDB · threat intelligence #430443

Security advisoryVulDB

VulDB · CVE-2026-121606

Security advisoryVulDB

VulDB · submission #1023261

Source referenceVulDB

gist.github.com/gajgdm6-cpu/cf98af20ddb77f27a7c112214a6280f7

Public exploit referenceVulDB

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance · not supplied

Weakness classification

Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-121606

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-347 ↗

Improper Verification of Cryptographic Signature

VulDB

CWE-345 ↗

Insufficient Verification of Data Authenticity

VulDB

Contributing organizations · 1

VulDB

Assigning organization

2026-11-04

Timeline

All times UTC

4 Nov 2026, 01:00
Advisory published
Publication date supplied by the source.
4 Nov 2026, 01:16
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-121606