Tengcontrol · Tengcontrol T-920 Plc · CVE-2019-9590
**Name of the Vulnerable Software and Affected Versions**
TENGCONTROL T-920 PLC version 5.5
**Description**
An issue allows remote attackers to cause a denial of service, resulting in a persistent failure mode. This can be achieved by sending a series of specific requests, identified as `UID 0x43`, to the TCP port 502.
**Recommendations**
For TENGCONTROL T-920 PLC version 5.5, as a temporary workaround, consider restricting access to TCP port 502 to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this issue.