CVE-2016-8563: Siemens Automation License Manager (ALM) before 5.3 SP3 Update 1 allows remote attackers to cause a denial...

Security readout for executives and security teams

This flaw can remotely knock Siemens Automation License Manager offline when vulnerable ALM systems receive malformed network traffic on TCP port 4410. The business impact is service disruption, not documented data theft or code execution. Priority depends on whether ALM is reachable from untrusted networks or supports operationally critical licensing. Exposure is most likely on hosts running Siemens ALM versions before 5.3 SP3 Update 1 with TCP 4410 reachable. Risk rises if the service is accessible beyond tightly controlled engineering, licensing, or administrative networks. Treat this as a targeted availability risk for Siemens licensing infrastructure. Prioritize remediation for ALM systems supporting production, engineering, or recovery operations, especially where TCP 4410 is reachable outside trusted management zones. Mitigation focus: Confirm Siemens ALM version and upgrade to 5.3 SP3 Update 1 or later where applicable.; Review the Siemens advisory and apply any vendor-specific compensating controls.; Restrict TCP 4410 access to required trusted systems only..

Prepared

Jun 13, 2026, 13:39 UTC (UTC+00:00)

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