CVE-2020-7498Network attack vector

Unauthenticated file-transfer access via fixed credentials

Published Jun 16, 2020 · Updated Aug 4, 2024

Hard-coded credentials in Schneider Electric Unity Loader and OS Loader all versions allow remote attackers to access Modicon PLC file transfers. The loaders embed fixed credentials intended to simplify file transfer, and the PLC service accepts them instead of deployment-specific credentials. No authentication or user interaction is required, but Schneider Electric has not specified the operations available after service access.

CVSS severity9.8
Critical
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Schneider Electric Unity Loader and OS Loader all versions allow remote attackers to access Modicon PLC file transfers. The loaders embed fixed credentials intended to simplify file transfer, and the PLC service accepts them instead of deployment-specific credentials. No authentication or user interaction is required, but Schneider Electric has not specified the operations available after service access.

The record

CVE
CVE-2020-7498
Published
Jun 16, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1694.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1694.002Insecure Credentials: Hardcoded Credentials

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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