CVE-2023-5409

Physical code execution via disclosed firmware key

Published Oct 13, 2023 · Updated Aug 2, 2024

Firmware tampering in HP t430 and t638 Thin Clients made before July 2023 allows physically proximate attackers to execute arbitrary code. The firmware trust chain relies on a signing key whose private component was publicly disclosed, allowing forged firmware to satisfy image-authenticity checks. Physical access and interaction with the device are required; successful tampering can elevate privileges or interrupt device operation.

CVSS severity7.3
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware tampering in HP t430 and t638 Thin Clients made before July 2023 allows physically proximate attackers to execute arbitrary code. The firmware trust chain relies on a signing key whose private component was publicly disclosed, allowing forged firmware to satisfy image-authenticity checks. Physical access and interaction with the device are required; successful tampering can elevate privileges or interrupt device operation.

The record

CVE
CVE-2023-5409
Published
Oct 13, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1542.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

7.3HP Inc.CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:C/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

T1542.001Pre-OS Boot: System Firmware

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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