Publication Date:
Last Update:
Current Version: V1.4
CVSS v3.1 Base Score: 8.2
Affected Product and Versions Remediation

All versions

All versions < V6.0.9

All versions

All versions

All versions < V8.2.1
Update to V8.2.1 or later version

Activate Field Interface Security in PCS 7 V9.0, and use a SIMATIC/SIPLUS CP443-1 Adv. to communicate with ES/OS
  • CVE-2018-16557: Configure protection level 3 (read/write protection)
  • Restrict network access to affected devices; restrict network access to port 102/tcp for Ethernet interfaces

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
Please follow the General Security Recommendations.

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download:, and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at:

The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) ( The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at:

CVSS v3.1 Base Score 7.5
CWE CWE-20: Improper Input Validation
CVSS v3.1 Base Score 8.2
CWE CWE-347: Improper Verification of Cryptographic Signature

  • Artem Zinenko from Kaspersky for pointing out that SIPLUS should also be mentioned
  • Zhang JiaWei and Qing YuLong from CNCERT/CC for coordinated disclosure of vulnerability CVE-2018-16556

V1.0 (2018-11-13): Publication Date
V1.1 (2019-05-14): Updated acknowledgements and added solution for S7-400H V6
V1.2 (2020-02-10): SIPLUS devices now explicitly mentioned in the list of affected products
V1.3 (2022-08-09): No fix planned for SIMATIC S7-400 PN/DP V6 and below CPU family, and for SIMATIC S7-400 H V4.5 and below CPU family
V1.4 (2023-01-10): No fix planned for SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants)