CVE-2025-53395

Administrator code execution via companion DLL loading

Published Aug 4, 2025 · Updated Aug 5, 2025

DLL search-path hijacking in Paramount Macrium Reflect through 2025-06-26 allows local users to execute code as administrator. ReflectMonitor.exe searches the opened .mrimgx file's directory for VSSSvr.dll and loads an attacker-placed library after mounting. Exploitation requires a malicious backup and same-directory DLL, plus an administrator who opens the backup and accepts the UAC prompt; the library then runs with administrator privileges.

CVSS severity7.7
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL search-path hijacking in Paramount Macrium Reflect through 2025-06-26 allows local users to execute code as administrator. ReflectMonitor.exe searches the opened .mrimgx file's directory for VSSSvr.dll and loads an attacker-placed library after mounting. Exploitation requires a malicious backup and same-directory DLL, plus an administrator who opens the backup and accepts the UAC prompt; the library then runs with administrator privileges.

The record

CVE
CVE-2025-53395
Published
Aug 4, 2025
Updated
Aug 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.7MITRECVSS:3.1/AV:L/AC:L/PR:H/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.

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-427Uncontrolled Search Path Element
T1574.001Hijack Execution Flow: DLL

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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