CVE-2020-7498

highpriority · track · 39OT risk · elevatedEPSS 0.014 · 72 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.36% (72nd) EPSS

CVSS 7.5 · high

Is it mine?

6 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

A CWE-798: Use of Hard-coded Credentials vulnerability exists in the Unity Loader and OS Loader Software (all versions). The fixed credentials are used to simplify file transfer. Today the use of fixed credentials is considered a vulnerability, which could cause unauthorized access to the file transfer service provided by the Modicon PLCs. This could result in various unintended results.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USprimaryCWE-798US

affected products (6)

Products and version ranges known to be affected.

n/a Unity Loader and OS Loader Software (All versions)≤ Unity Loader and OS Loader Software (All versions)enisa_euvdEU
Schneider Electric Modicon Quantum≤ 4.6fstec_bduRU
Schneider Electric OS Loaderall versionsfstec_bduRU
Schneider Electric Unity Loaderall versionsfstec_bduRU
schneider-electric os loaderall versionsnvdUScpe:2.3:a:schneider-electric:os_loader:*:*:*:*:*:*:*:*
schneider-electric unity loaderall versionsnvdUScpe:2.3:a:schneider-electric:unity_loader:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2020-06-16modified 2026-06-17

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+2276 more

references (5)

External citations — patches, advisories, analysis.

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