Publication Date:
Last Update:
Current Version: V1.2
CVSS v3.1 Base Score: 7.5
Affected Product and Versions Remediation

All versions < V5.2a
Update to V5.2a as available in Nucleus PLUS V1.15 and apply the patch "v2022.11"

All versions < V5.4
Update to V5.4 as available in Nucleus PLUS V2.1f and apply the patch "v2022.11"

All versions < V2012.08.1
Update to V2012.08.1 and apply the patch "v2022.11"

All versions < V2017.02.4
Update to V2017.02.4 and apply the patch "2017.02.4_patch_CVE-2022-38371"

Versions including affected FTP server
Contact customer support to receive patch and update information
  • Configure TCP_MAX_KEEPALIVES to a lower value such as 3. Additionally, configure TCP_KEEPALIVE_INTERVAL and TCP_KEEPALIVE_DELAY be set to 3 seconds. Rebuild your application.

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-400: Uncontrolled Resource Consumption

  • Kaspersky Lab ICS CERT for coordinated disclosure
  • WAGO for reporting the vulnerability and coordination efforts

V1.0 (2022-10-11): Publication Date
V1.1 (2022-12-13): Added specific mitigation
V1.2 (2023-02-14): Added fix for Nucleus NET in Nucleus PLUS V1, V2, and for Nucleus ReadyStart V2012