CVE-2026-36433Public exploit

Persistent code execution via unsigned firmware flashing

Published Sep 9, 2026 · Updated Sep 10, 2026

Missing firmware verification in Actions Semiconductor Tool-Media Player Utilities 4.46 allows physically proximate attackers to execute code. Production.dll accepts the firmware path named by the blank FWFILE setting and writes the selected image to the connected device without a signature, hash, or authenticity check. Physical USB access to a supported media player is required, and flashed attacker firmware persists across factory resets and power cycles.

CVSS severityUnavailable
Unscored
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing firmware verification in Actions Semiconductor Tool-Media Player Utilities 4.46 allows physically proximate attackers to execute code. Production.dll accepts the firmware path named by the blank FWFILE setting and writes the selected image to the connected device without a signature, hash, or authenticity check. Physical USB access to a supported media player is required, and flashed attacker firmware persists across factory resets and power cycles.

The record

CVE
CVE-2026-36433
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-347, T1601.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1601.001Modify System Image: System Firmware

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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