TCP Payload Length Vulnerability in Capital Embedded AR Classic and SIMOTICS Products

CVE-2021-31890

What is CVE-2021-31890?

A vulnerability has been discovered in various Siemens products, including Capital Embedded AR Classic and SIMOTICS CONNECT 400, where the total length of a TCP payload is not properly checked. This oversight can result in severe side effects, such as information leaks or denial-of-service conditions, which may compromise system integrity depending on how the network buffer is structured in memory. Organizations utilizing these systems should be aware of this vulnerability and take necessary precautions to mitigate potential risks.

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