CVE-2019-9590: Tengcon T-920 PLC Firmware

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

An issue was discovered on TENGCONTROL T-920 PLC v5.5 devices. It allows remote attackers to cause a denial of service (persistent failure mode) by sending a series of \x19\xb2\x00\x00\x00\x06\x43\x01\x00\xac\xff\x00 (aka UID 0x43) requests to TCP port 502.

Affected products

• Tengcon T-920 PLC Firmware: version 5.5 only

Published 2019-03-06. Last modified 2026-06-17.