CVE-2025-8656

Software downgrade via unvalidated firmware version

Published Aug 6, 2025 · Updated Aug 6, 2025

Protection mechanism failure in JVCKENWOOD DMX958XR 1.0.0509.3100 allows physically proximate attackers to install older firmware. The libSystemLib update path accepts firmware version information without adequately validating whether the image predates the installed release. Physical access and crafted update media enable the downgrade; code execution as root requires chaining another vulnerability.

CVSS severity6.8
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failure in JVCKENWOOD DMX958XR 1.0.0509.3100 allows physically proximate attackers to install older firmware. The libSystemLib update path accepts firmware version information without adequately validating whether the image predates the installed release. Physical access and crafted update media enable the downgrade; code execution as root requires chaining another vulnerability.

The record

CVE
CVE-2025-8656
Published
Aug 6, 2025
Updated
Aug 6, 2025
Vendor
JVCKENWOOD
Product
DMX958XR
Classifications
CWE-693, T1601.002
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0509.3100

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

JVCKENWOOD · DMX958XRversion=1.0.0509.3100

Published CVSS scores

6.8Zero Day InitiativeCVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1601.002Downgrade System Image

Public exploit references

No public exploit references are available in this record.

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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