CVE-2025-53869Network attack vector

Trust-store replacement via unvalidated certificate downloads

Published Jan 29, 2026 · Updated Jan 29, 2026

Improper certificate validation in affected MFP firmware allows man-in-the-middle attackers to replace the trusted root certificate set. The CA certificate download function accepts certificates from an attacker-controlled download server without properly validating its server certificate, then installs the supplied CA certificates. An unauthenticated attacker must intercept or redirect the device's network connection; successful exploitation modifies the device's trust store without reported disclosure or service interruption.

CVSS severity6.3
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in affected MFP firmware allows man-in-the-middle attackers to replace the trusted root certificate set. The CA certificate download function accepts certificates from an attacker-controlled download server without properly validating its server certificate, then installs the supplied CA certificates. An unauthenticated attacker must intercept or redirect the device's network connection; successful exploitation modifies the device's trust store without reported disclosure or service interruption.

The record

CVE
CVE-2025-53869
Published
Jan 29, 2026
Updated
Jan 29, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1553.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.7JPCERT/CCCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
6.3JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1553.004Install Root Certificate

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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