CVE-2020-7543
Last modified
CVE-2020-7543 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions), that could cause denial of service when a specially crafted Read Physical Memory request over Modbus is sent to the controller.. EPSS estimates a 1.31% chance of exploitation in the next 30 days.
Description
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions), that could cause denial of service when a specially crafted Read Physical Memory request over Modbus is sent to the controller.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Schneider-Electric | Modicon M580 Bmep584040 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep582040 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep586040 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep585040 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep582020 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep581020 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep584020 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep583040 Firmware | < 3.20 |
| Schneider-Electric | Modicon M580 Bmep583020 Firmware | < 3.20 |
| Schneider-Electric | Modicon M340 Bmxp341000 Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp342000 Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp3420102 Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp3420102cl Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp342020 Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp3420302 Firmware | < 3.30 |
| Schneider-Electric | Modicon M340 Bmxp3420302cl Firmware | < 3.30 |
References
- https://www.se.com/ww/en/download/document/SEVD-2020-343-08/Vendor Advisory
- https://www.se.com/ww/en/download/document/SEVD-2020-343-08/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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