CVE-2014-2251: Siemens SIMATIC s7-1500 CPU Firmware

High severity, CVSS 8.3. EPSS: 2.7% chance of exploitation in the next 30 days.

The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.

Affected products

• Siemens SIMATIC s7-1500 CPU Firmware: up to and including 1.1.2; version 1.0.1 only; version 1.1.0 only; version 1.1.1 only

Published 2014-03-16. Last modified 2026-06-17.