CVE-2025-47904

Arbitrary filesystem installation via unsigned upgrade packages

Published Feb 24, 2026 · Updated Feb 24, 2026

Code-integrity failure in Microchip Technology TimeProvider 4100 before 2.5 allows local users to install a tampered filesystem. The upgrade workflow accepts packages without asymmetric signature verification, so a modified package can replace the appliance filesystem. Exploitation requires root access and extraction of the symmetric image key, and upgrades are reachable only through the management port.

CVSS severity5.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code-integrity failure in Microchip Technology TimeProvider 4100 before 2.5 allows local users to install a tampered filesystem. The upgrade workflow accepts packages without asymmetric signature verification, so a modified package can replace the appliance filesystem. Exploitation requires root access and extraction of the symmetric image key, and upgrades are reachable only through the management port.

The record

CVE
CVE-2025-47904
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Microchip Technology
Product
TimeProvider 4100
Classifications
CWE-345, CWE-494, T1601.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 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?

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

  1. Affected versionversion=0 <2.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Microchip Technology · TimeProvider 4100version=0 <2.5

Published CVSS scores

5.7Microchip TechnologyCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L
4.1NIST NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
5.5Microchip Technology PSIRTCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L/E:P

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-494Download of Code Without Integrity Check
T1601.001Patch 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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