CVE-2023-36380: Siemens CP-8031 Firmware

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05.11 (only with activated debug support)), CP-8050 MASTER MODULE (All versions < CPCI85 V05.11 (only with activated debug support)). The affected devices contain a hard-coded ID in the SSH `authorized_keys` configuration file. An attacker with knowledge of the corresponding private key could login to the device via SSH. Only devices with activated debug support are affected.

Affected products

• Siemens CP-8031 Firmware: before 05.11 (fixed in 05.11)
• Siemens CP-8050 Firmware: before 05.11 (fixed in 05.11)

Published 2023-10-10. Last modified 2026-06-17.