ICSA-21-257-20: Siemens LOGO! CMR and SIMATIC RTU 3000
CISA advisory · released 2021-09-14
Source record Collected from CISA's CSAF advisory feed
- Distribution label in the document: TLP:WHITE
- Revision 1, 2021-09-14 (final)
CISA's summary
Risk evaluation: Successful exploitation of these vulnerabilities could allow an attacker with access to any of the interfaces of an affected device to impact the availability or to communicate with invalid certificates.
Products, as the advisory lists them
| Vendor | Product | Version |
|---|---|---|
| Siemens | LOGO! CMR2040 | < 2.2 |
| Siemens | SIMATIC RTU 3000 family | vers:all/* |
| Siemens | LOGO! CMR2020 | < 2.2 |
DeSpy has not checked any unit, hardware revision or firmware.
Vulnerabilities in this advisory
- CVE-2020-36475 · CWE-131
The calculations performed in the third-party component Mbed TLS are not limited. Supplying overly large parameters could lead to denial-of-service condition when generating Diffie-Hellman key pairs.CVE-2020-36475 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).
- CVE-2020-36478 · CWE-295
The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to remotely execute arbitrary code.CVE-2020-36478 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:H/A:N).
Acknowledgments, as the advisory lists them
- Siemens: reporting these vulnerabilities to CISA
The advisory's legal notice
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Sources
DeSpy's copy of this version is dated 2026-09-28.
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