A new vulnerability, identified as CVE-2022-31805, has been discovered in the CODESYS Development System. This vulnerability affects multiple components and versions, and involves the unprotected transmission of passwords for communication between clients and servers. In this in-depth post, we will discuss the details of the CVE-2022-31805 vulnerability, provide code snippets to explain the issue, link to original references, and give you a comprehensive understanding of the exploit. Read on to learn more about this important security issue and how it might impact your organization.

Vulnerability Details

CVE-2022-31805 is a security vulnerability in the CODESYS Development System, a widely-used automation software suite. The vulnerability exists in multiple components and versions of the platform and stems from the unprotected transmission of passwords. This vulnerability allows an attacker to intercept and potentially decrypt passwords used for connections between clients and servers, potentially compromising the security of the overall system.

Code Snippet

The vulnerability in the CODESYS Development System can be illustrated with the following code snippet:

// client-side password is transmitted without encryption
bool transmitPassword(char *password)
  char buffer[1024]; 
  int bufferSize;
  // copy password to buffer without any encryption
  strcpy(buffer, password);
  bufferSize = strlen(password);
  // transmit the buffer to the server
  transmitToServer(buffer, bufferSize);

  return true;

As shown in the example above, the password is simply copied to a buffer which is then transmitted to a server without any encryption. This leads to the transmission of unprotected password information, allowing an attacker to easily intercept and compromise the password.

Original References

- CVE-2022-31805 - NVD Entry
- CODESYS Advisory

Exploit Details

An attacker capable of intercepting network traffic between a CODESYS client and server could potentially exploit CVE-2022-31805. By monitoring network traffic, the attacker could capture and analyze the transmitted packets, identifying unencrypted password information. This captured information could then be used by the attacker to log in to the system or impersonate a client, leading to further malicious activities and possible system compromise.


To mitigate the potential risks and impacts of this vulnerability, users are advised to take the following steps:

1. Update your CODESYS Development System to the latest version, ensuring the affected components are upgraded as well:

CODESYS HMI: V3.5.17.30 or later

2. Use a secure communication protocol, such as VPN or encrypted TLS tunneling, to protect the communication between CODESYS clients and servers, providing additional layers of security irrespective of the application's internal encryption mechanisms.

3. Educate team members on the importance of security best practices while using CODESYS Development System and other industrial automation platforms, including strong password management and secure network configurations.


CVE-2022-31805 is a critical vulnerability affecting multiple components in multiple versions of the CODESYS Development System. By exploiting this vulnerability, an attacker could potentially intercept and compromise unprotected password information, leading to serious security risks. By understanding the details of CVE-2022-31805, upgrading affected systems, and implementing best security practices, organizations can help mitigate the risks associated with this vulnerability and maintain a secure industrial automation environment.


Published on: 06/24/2022 08:15:00 UTC
Last modified on: 07/07/2022 13:40:00 UTC