ICSA-23-103-13: Siemens SCALANCE Switch Families

CISA's summary

Summary: Siemens has released a new firmware version for SCALANCE X-200 and X-200 IRT switches that address Bad Alloc vulnerabilities in the underlying operating system and recommends to update to the latest versions. Siemens recommends countermeasures for products where updates are not, or not yet available.

Products, as the advisory lists them

DeSpy has not checked any unit, hardware revision or firmware.

Vulnerabilities in this advisory

• CVE-2020-28895 — CVE-2020-28895 · CWE-190

  In Wind River VxWorks, memory allocator has a possible overflow in calculating the memory block's size to be allocated by calloc(). As a result, the actual memory allocated is smaller than the buffer size specified by the arguments, leading to memory corruption.

• CVE-2020-35198 — CVE-2020-35198 · CWE-190

  The APIs cacheDmaMalloc()/cacheArchDmaMalloc()/mmap64() align the size of the requested buffer with the memory page size of the target platform. If the requested size is large enough to cause integer overflow by the alignment calculation, a valid pointer to a buffer that is smaller than the requested size is returned, opening the door to use for heap overflow attacks.

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

• The advisory at cisa.gov
• The CSAF document (JSON)

DeSpy's copy of this version is dated 2026-09-28.