ICSA-22-286-07: Siemens Nucleus RTOS FTP Server
CISA advisory · released 2022-10-11
Source record Collected from CISA's CSAF advisory feed
- Distribution label in the document: TLP:WHITE
- Revision 3, 2023-02-14 (final)
CISA's summary
Summary: The FTP server of the networking component (Nucleus NET) in Nucleus Real-Time Operating System (RTOS) does not properly release memory resources that were reserved for incomplete connection attempts by FTP clients. This could allow a remote attacker to generate a denial of service condition on devices that incorporate a vulnerable version of the FTP server. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet available.
Products, as the advisory lists them
| Vendor | Product | Version |
|---|---|---|
| Siemens | Nucleus NET for Nucleus PLUS V1 | <V5.2a |
| Siemens | Nucleus NET for Nucleus PLUS V2 | <V5.4 |
| Siemens | Nucleus ReadyStart V3 V2012 | <V2012.08.1 |
| Siemens | Nucleus ReadyStart V3 V2017 | <V2017.02.4 |
| Siemens | Nucleus Source Code | All_versions_including_affected_FTP_server |
DeSpy has not checked any unit, hardware revision or firmware.
Vulnerabilities in this advisory
- CVE-2022-38371 — CVE-2022-38371 · CWE-400
The FTP server does not properly release memory resources that were reserved for incomplete connection attempts by FTP clients. This could allow a remote attacker to generate a denial of service condition on devices that incorporate a vulnerable version of the FTP server.
Acknowledgments, as the advisory lists them
- Siemens ProductCERT: reporting this vulnerability to CISA.
- Kaspersky Lab ICS CERT: coordinating disclosure
- WAGO: reporting the vulnerability and coordination efforts
The advisory's legal notice
Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.
Sources
DeSpy's copy of this version is dated 2026-09-28.
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