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Fencer Vulns
high 7.5

CVE-2020-7538 json

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now U…

published 2020-11-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28663

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause a crash of the PLC simulator present in EcoStruxureª Control Expert software when receiving a specially crafted request over Modbus.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-315-03 updated cvss 7.5

Schneider Electric PLC Simulator for EcoStruxure Control Expert

  • Schneider Electric Software, LLC PLC Simulator for EcoStruxure Control Expert Schneider Electric Software, LLC PLC Simulator for Unity Pro (former name of EcoStruxure Control Expert)
    affected: vendor fix, mitigation “Schneider Electric has released Version 15.0 of the EcoStruxure Control Expert software to mitigate this vulnerability. It is available for download on the Schneider Electric website.” se.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions)

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.