No exploitation reportedFix available

CVE-2020-7538

No exploitation reported by the sources we read.

Published2020-11-19
WeaknessCWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2020-11-1922:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-7538?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-7538?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric ecostruxure control expert

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-20-315-03 CISA2 known affected
Schneider Electric PLC Simulator for EcoStruxure Control Expert
PLC Simulator for Unity Pro (former name of EcoStruxure Control Expert): all versions · PLC Simulator for EcoStruxure Control Expert: all versions

Full record on NVD

Fix

Vendor fix CISA ICSA-20-315-03 · 2 productsHarden the engineering workstation running PLC Simulator for EcoStruxure Control Expert
Mitigation from the vendor CISA ICSA-20-315-03 · 2 productsSchneider 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.
Mitigation from the vendor CISA ICSA-20-315-03 · 2 productsIn the option dialog box of the PLC simulator, set the listening IP Address to 127.0.0.1 (localhost), which will prevent remote network connections to the PLC simulator.
Mitigation from the vendor CISA ICSA-20-315-03 · 2 productsThe default listening IP address is: 0.0.0.0. The default setting exposes the PLC to the vulnerability described in this advisory.
Mitigation from the vendor CISA ICSA-20-315-03 · 2 productsSchneider Electric recommends using appropriate patching methodologies when applying these patches. It also strongly recommends the use of back-ups and evaluating the impact of these patches in a test and development environment or on offline infrastructure. Contact Schneider Electric's Customer Ca…
Mitigation from the vendor CISA ICSA-20-315-03 · 2 productsIf users choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit:

Advisories and patches

www.se.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-754read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2020-11-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-7538?

Is CVE-2020-7538 actively exploited?

Active exploitation of CVE-2020-7538 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-7538?

CVE-2020-7538 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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