CVE-2020-7537 Denial of service in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions)
A specially crafted Modbus request can cause a denial of service in Schneider Electric Modicon controllers, requiring vendor patches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-7537?
CVE-2020-7537 is a high-severity denial of service vulnerability in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions), published on 11 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-754
Which versions are affected by CVE-2020-7537?
It affects 19 products.
Products include Schneider-Electric Modicon M340 Bmxp341000 Firmware, Schneider-Electric Modicon M340 Bmxp342000 Firmware, Schneider-Electric Modicon M340 Bmxp3420102 Firmware, Schneider-Electric Modicon M340 Bmxp3420102cl Firmware, Schneider-Electric Modicon M340 Bmxp342020 Firmware, Schneider-Electric Modicon M340 Bmxp3420302 Firmware and 13 more.
How do I fix CVE-2020-7537?
No fix has been published for CVE-2020-7537 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-7537 being exploited?
There is no known exploitation of CVE-2020-7537 in the wild and no public exploit code.
Other vulnerabilities in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions)
- CVE-2021-22786 Information disclosure in Legacy Modicon Quantum
- CVE-2022-22724 Denial of service in Modicon M340 CPUs: BMXP34 (All Versions)
- CVE-2020-7543 Denial of service in Modicon M580, Modicon M340, Legacy Controllers Modicon Quantum & Modicon Premium (see security notifications for affected versions)
Sources
Also known as GHSA-9vj3-52fm-gw3x.