CVE-2012-3017: Siemens SIMATIC S7-400 PN CPU devices with firmware 5.x allow remote attackers to cause a denial of service...

Security readout for executives and security teams

This issue can let a remote attacker disrupt certain Siemens S7-400 PN CPUs by sending malformed network traffic. The reported outcome is a defect-mode transition and service outage, which matters because these devices can support industrial processes. The source bundle does not provide a CVSS score or confirm active exploitation. Exposure is most likely where Siemens SIMATIC S7-400 PN CPU firmware 5.x devices are reachable over networks that can send HTTP or IP traffic to the controller. Risk is lower when controller networks are segmented and only trusted engineering stations can reach device services. Prioritize review for sites using Siemens S7-400 PN CPUs in production environments. The business concern is process disruption rather than data theft. Because patch details are not included in the provided evidence, remediation should start with vendor advisory confirmation, inventory, and network restriction. Mitigation focus: Review Siemens SSA-617264 and US-CERT ICSA-12-212-02 for official remediation guidance.; Inventory SIMATIC S7-400 PN CPUs and identify firmware 5.x devices.; Restrict controller network access to trusted engineering and operations hosts..

Prepared

Jun 27, 2026, 17:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.