How severe is CVE-2020-7523?

CVE-2020-7523 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-7523 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7523?

CVE-2020-7523 primarily affects Schneider-electric Modbus Driver Suite. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-7523?

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

When was CVE-2020-7523 published?

CVE-2020-7523 was published on 2020-08-31 and last updated on 2026-06-17.

CVE-2020-7523

CVE-2020-7523 is a high-severity vulnerability in Schneider-electric Modbus Driver Suite with a CVSS 3.x base score of 7.8. 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-269.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Schneider-electric Modbus Driver Suite
Published: 2020-08-31
Last modified: 2026-06-17

Description

Improper Privilege Management vulnerability exists in Schneider Electric Modbus Serial Driver (see security notification for versions) which could cause local privilege escalation when the Modbus Serial Driver service is invoked. The driver does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Frequently asked questions

What is CVE-2020-7523?: Improper Privilege Management vulnerability exists in Schneider Electric Modbus Serial Driver (see security notification for versions) which could cause local privilege escalation when the Modbus Serial Driver service is invoked. The driver does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
How severe is CVE-2020-7523?: CVE-2020-7523 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-7523 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7523?: CVE-2020-7523 primarily affects Schneider-electric Modbus Driver Suite. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-7523?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-7523 published?: CVE-2020-7523 was published on 2020-08-31 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2020-224-01/

Affected products (3)

cpe:2.3:a:schneider-electric:modbus_driver_suite:*:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:modbus_serial_driver:*:*:*:*:*:*:x86:*
cpe:2.3:a:schneider-electric:modbus_serial_driver:*:*:*:*:*:*:x64:*

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