ICSA-21-012-02: Siemens SCALANCE X Switches (Update B)
CISA advisory · released 2021-01-12
Source record Collected from CISA's CSAF advisory feed
- Distribution label in the document: TLP:WHITE
- Revision 4, 2022-12-13 (final)
CISA's summary
Summary: SCALANCE X devices might not generate a unique random key after factory reset, and use a private key shipped with the firmware. Siemens has released updates for the affected products and recommends to update to the latest versions.
Products, as the advisory lists them
| Vendor | Product | Version |
|---|---|---|
| Siemens | SCALANCE X-200 switch family (incl. SIPLUS NET variants) | <V5.2.5 |
| Siemens | SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) | <V5.5.0 |
| Siemens | SCALANCE X-200RNA switch family | <V3.2.7 |
| Siemens | SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) | <V4.1.0 |
DeSpy has not checked any unit, hardware revision or firmware.
Vulnerabilities in this advisory
- CVE-2020-28391 — CVE-2020-28391 · CWE-321
Devices create a new unique key upon factory reset, except when used with C-PLUG. When used with C-PLUG the devices use the hardcoded private RSA-key shipped with the firmware-image. An attacker could leverage this situation to a man-in-the-middle situation and decrypt previously captured traffic.
- CVE-2020-28395 — CVE-2020-28395 · CWE-321
Devices do not create a new unique private key after factory reset. An attacker could leverage this situation to a man-in-the-middle situation and decrypt previously captured traffic.
Acknowledgments, as the advisory lists them
- Siemens ProductCERT: reporting these vulnerabilities to CISA.
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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