CVE-2025-44039Public exploit

Boot-log disclosure via unauthenticated UART output

Published May 13, 2025 · Updated May 13, 2025

Information disclosure in CP Plus CP-XR-DE21-S 4G Router firmware 1.031.022 allows local users to read boot logs through the UART port. The exposed UART transmit pins output boot logs without authentication, including hardware addresses, register dumps, firmware version, BLE events, and sensor data. Exploitation requires disassembling the router, soldering its UART pins, and attaching a USB-to-UART converter.

CVSS severity5.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in CP Plus CP-XR-DE21-S 4G Router firmware 1.031.022 allows local users to read boot logs through the UART port. The exposed UART transmit pins output boot logs without authentication, including hardware addresses, register dumps, firmware version, BLE events, and sensor data. Exploitation requires disassembling the router, soldering its UART pins, and attaching a USB-to-UART converter.

The record

CVE
CVE-2025-44039
Published
May 13, 2025
Updated
May 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1005
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2025CVE publishedPublication date reported by the CVE source.
  2. May 13, 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?

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

5.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1005Data from Local System

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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