PatchSiren cyber security CVE debrief

CVE-2025-30033 Siemens CVE debrief

A DLL hijacking vulnerability in Siemens' setup components allows arbitrary code execution during application installation. The vulnerability affects 80+ Siemens industrial software products using the affected setup component. With a CVSS 3.1 score of 7.8 (HIGH), this local attack vector requires user interaction but grants high impact on confidentiality, integrity, and availability. The vulnerability was disclosed in August 2025 and has received multiple advisory updates through February 2026, with vendor fixes available for many products but some remaining without planned remediation.

Vendor: Siemens
Product: Automation License Manager V6.0
CVSS: HIGH 7.8
CISA KEV: Not listed in stored evidence
Original CVE published: 2025-08-12
Original CVE updated: 2026-03-12
Advisory published: 2025-08-12
Advisory updated: 2026-03-12

Who should care

Organizations operating Siemens industrial automation software including SIMATIC, PCS 7, TIA Portal, WinCC, and related engineering tools. Critical infrastructure operators, manufacturing facilities, and OT security teams should prioritize assessment due to the broad product impact and potential for supply chain compromise during software installation.

Technical summary

The affected setup component in Siemens industrial software products is vulnerable to DLL hijacking (CWE-427). When a legitimate user installs an application using the affected setup component, an attacker with local access can cause execution of arbitrary code by placing a malicious DLL in a location that the installer searches before legitimate system directories. The vulnerability requires local access and user interaction but results in complete compromise of the host system (CVSS 3.1: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Defensive priority

HIGH

Recommended defensive actions

Apply vendor-provided updates for affected Siemens products where available; consult Siemens ProductCERT advisory for specific product patch versions
Harden application hosts to prevent local access by untrusted personnel
Install applications only from empty directories to minimize presence of malicious DLLs
Prioritize patching for internet-accessible or critical OT/ICS systems
Implement application whitelisting and execution controls on engineering workstations
Monitor for anomalous DLL loading behavior during software installation processes

Evidence notes

The CISA CSAF advisory ICSA-25-226-22, republished from Siemens ProductCERT SSA-282044, documents this vulnerability affecting Siemens industrial software products. The advisory has undergone 10 revision updates through February 2026, indicating ongoing vendor response and patch availability changes. The CVSS vector confirms local attack vector with user interaction required.

Official resources

2025-08-12