CVE-2021-45033: Siemens CP-8000 Master Module With I/o -25/+70 Firmware

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability has been identified in CP-8000 MASTER MODULE WITH I/O -25/+70°C (All versions < V16.20), CP-8000 MASTER MODULE WITH I/O -40/+70°C (All versions < V16.20), CP-8021 MASTER MODULE (All versions < V16.20), CP-8022 MASTER MODULE WITH GPRS (All versions < V16.20). An undocumented debug port uses hard-coded default credentials. If this port is enabled by a privileged user, an attacker aware of the credentials could access an administrative debug shell on the affected device.

Affected products

• Siemens CP-8000 Master Module With I/o -25/+70 Firmware: before 16.20 (fixed in 16.20)
• Siemens CP-8000 Master Module With I/o -40/+70 Firmware: before 16.20 (fixed in 16.20)
• Siemens CP-8021 Master Module Firmware: before 16.20 (fixed in 16.20)
• Siemens CP-8022 Master Module With Gprs Firmware: before 16.20 (fixed in 16.20)

Published 2022-01-11. Last modified 2026-06-17.