CVE-2021-40365 : What You Need to Know

This CVE details a vulnerability that can be exploited to cause a denial of service in Siemens devices.

Understanding CVE-2021-40365

This section provides insights into the nature and impact of the CVE-2021-40365 vulnerability.

What is CVE-2021-40365?

CVE-2021-40365 is a vulnerability that arises from affected Siemens devices not processing certain specially crafted packets, leading to a denial of service.

The Impact of CVE-2021-40365

The vulnerability could allow an attacker to exploit it, potentially causing a denial of service in the affected Siemens devices.

Technical Details of CVE-2021-40365

Explore the technical aspects and details of CVE-2021-40365.

Vulnerability Description

The vulnerability in Siemens devices results from the incorrect processing of specific packets, which could lead to a denial of service.

Affected Systems and Versions

The following Siemens products are affected by this vulnerability:

SIMATIC Drive Controller CPU 1504D TF
SIMATIC Drive Controller CPU 1507D TF
SIMATIC ET 200SP Open Controller CPU 1515SP PC2
SIMATIC S7-1200 CPU family
SIMATIC S7-1500 CPU models
SIPLUS ET 200SP and S7-1500 CPU models
SIMATIC S7-PLCSIM Advanced
Others (refer to the full list in the reference link)

Exploitation Mechanism

The vulnerability can be exploited by sending specially crafted packets to port 102/tcp, causing affected devices to malfunction and potentially leading to a denial of service.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-40365.

Immediate Steps to Take

Apply patches provided by Siemens to fix the vulnerability.
Implement network segmentation to restrict access to vulnerable devices.

Long-Term Security Practices

Regularly update and patch all devices to address security vulnerabilities.
Conduct security training for personnel to recognize and respond to potential threats.

Patching and Updates

Ensure all affected Siemens devices are updated with the latest patches released by the vendor.