Apache · Apache Plc4X · CVE-2021-43083
**Name of the Vulnerable Software and Affected Versions**
Apache PLC4X - PLC4C versions prior to 0.9.1
**Description**
The issue is related to an unsigned integer underflow flaw inside the tcp transport. To exploit this, a user would have to actively connect to a malicious device that could send a response with invalid content. The probability of this being exploited is currently considered minimal, but this could change in the future, especially with industrial networks growing together.
**Recommendations**
For versions prior to 0.9.1, update to version 0.9.1 to address the issue. As a temporary workaround, consider restricting connections to trusted devices to minimize the risk of exploitation.