A CWE-754 Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause a denial of service vulnerability when a specially crafted packet is sent to the controller over HTTP.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-7539
• https://www.se.com/ww/en/download/document/SEVD-2020-343-03/