How severe is CVE-2020-28212?

CVE-2020-28212 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28212 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28212?

CVE-2020-28212 affects Schneider-electric Ecostruxure Control Expert. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28212?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-28212 published?

CVE-2020-28212 was published on 2020-11-19 and last updated on 2026-06-17.

CVE-2020-28212

CVE-2020-28212 is a critical-severity vulnerability in Schneider-electric Ecostruxure Control Expert with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-307
Affected product: Schneider-electric Ecostruxure Control Expert
Published: 2020-11-19
Last modified: 2026-06-17

Description

A CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause unauthorized command execution when a brute force attack is done over Modbus.

Frequently asked questions

What is CVE-2020-28212?: A CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions) that could cause unauthorized command execution when a brute force attack is done over Modbus.
How severe is CVE-2020-28212?: CVE-2020-28212 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28212 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28212?: CVE-2020-28212 affects Schneider-electric Ecostruxure Control Expert. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28212?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-28212 published?: CVE-2020-28212 was published on 2020-11-19 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2020-315-07

Affected products (1)

cpe:2.3:a:schneider-electric:ecostruxure_control_expert:*:*:*:*:*:*:*:*

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