CVSS v3 7.5
ATTENTION: Exploitable remotely/low skill level to exploit
**Vendor:**Siemens
**Equipment:**SINAMICS PERFECT HARMONY GH180 Drives NXG I and NXG II
**Vulnerability:**Uncontrolled Resource Consumption
Successful exploitation of this vulnerability could allow an attacker with access to the Ethernet Modbus Interface to cause a denial-of-service condition exceeding the number of available connections.
The following SINAMICS PERFECT HARMONY GH180 products are affected:
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
Successful exploitation requires no privileges and no user interaction. An attacker with network access to the device could use the vulnerability to compromise availability of the affected system.
CVE-2019-6578 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens reported this vulnerability to NCCIC.
Siemens recommends that affected users upgrade to NXGpro control. Please contact Siemensβ customer service to obtain and install the upgrade.
Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:
For more information see Siemens advisory SSA-606525 located at:
<https://www.siemens.com/cert/advisories>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
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