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Esmpro ManagerApplication · Nec

CVE-2020-27859

HIGH · 7.5 CVSS v3.1 Published 2021-01-20
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
This vulnerability allows remote attackers to disclose sensitive information on affected installations of NEC ESMPRO Manager 6.42. Authentication is not required to exploit this vulnerability. The specific flaw exists within the GetEuaLogDownloadAction class. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose information in the context of SYSTEM. Was ZDI-CAN-9607.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

This is a path traversal vulnerability in NEC ESMPRO Manager 6.42. The GetEuaLogDownloadAction class fails to validate user-supplied paths before using them in file operations, allowing unauthenticated remote attackers to read arbitrary files on the system by manipulating path traversal sequences (e.g., '../'). The vulnerability executes with SYSTEM privileges.

MitigationApply the vendor patch for CVE-2020-27859 or upgrade to a patched version. If immediate patching is not possible, restrict network access to the ESMPRO Manager service and implement input validation to block directory traversal sequences in file path parameters.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Esmpro ManagerApplication
Affected:= 6.42

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm NEC ESMPRO Manager is installed
    Check for the ESMPRO Manager installation directory (commonly in C:\Program Files\NEC\ESMPRO Manager or C:\NEC\ESMPRO Manager on Windows). Also verify the 'ESMPRO Manager' Windows service exists.
    Affected if The software is installed on the system
  2. Verify the exact version is 6.42
    Check the version of NEC ESMPRO Manager. Right-click on the ESMPRO Manager executable or access the program's About/Help section. Alternatively, check the Windows service version information.
    Affected if The installed version is exactly 6.42
  3. Confirm the GetEuaLogDownloadAction web endpoint is accessible
    Identify the ESMPRO Manager web interface URL (commonly on port 8080 or 8443). The vulnerable endpoint GetEuaLogDownloadAction is typically accessed via a URL path containing 'GetEuaLogDownloadAction' - attempt to access this endpoint to confirm it responds.
    Affected if The web interface is accessible and the GetEuaLogDownloadAction endpoint returns a valid response
  4. Check if the service is exposed to network
    Review Windows Firewall rules or network ACLs to determine if the ESMPRO Manager web service port (8080/8443) is listening on external network interfaces or open to untrusted networks.
    Affected if The ESMPRO Manager web service is reachable from untrusted network segments

If NEC ESMPRO Manager version 6.42 is installed and the GetEuaLogDownloadAction web endpoint is accessible, the system is affected by this path traversal vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor patch for CVE-2020-27859 or upgrade to a patched version. If immediate patching is not possible, restrict network access to the ESMPRO Manager service and implement input validation to block directory traversal sequences in file path parameters.

Fix this in Esmpro Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing3.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-27859 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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