ICSA-22-069-06: Siemens COMOS

CISA's summary

Summary: COMOS uses Drawings SDK from Open Design Alliance that is affected by multiple vulnerabilities that could be triggered when the application reads files in DGN, DXF or DWG file formats. If a user is tricked to open a malicious file with the affected application, an attacker could leverage the vulnerability to leak information or potentially perform remote code execution in the context of the current process. Siemens has released an update for the COMOS and recommends to update to the latest version.

Products, as the advisory lists them

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

Vulnerabilities in this advisory

• CVE-2021-25173 — CVE-2021-25173 · CWE-789

  Open Design Alliance Drawings SDK before 2021.12 contains a memory allocation with excessive size vulnerability while parsing specially crafted DGN files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-12019)

• CVE-2021-25174 — CVE-2021-25174 · CWE-789

  Open Design Alliance Drawings SDK before 2021.12 contains a memory allocation with excessive size vulnerability while parsing specially crafted DGN files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-12026)

• CVE-2021-25175 — CVE-2021-25175 · CWE-822

  Open Design Alliance Drawings SDK before 2021.11 contains a type conversion vulnerability while parsing specially crafted DXF and DWG files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-11912, ZDI-CAN-11993, ZDI-CAN-11988)

• CVE-2021-25176 — CVE-2021-25176 · CWE-822

  Open Design Alliance Drawings SDK before 2021.11 contains a NULL pointer dereference vulnerability while parsing DXF and DWG files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-11913, ZDI-CAN-11989)

• CVE-2021-25177 — CVE-2021-25177 · CWE-843

  Open Design Alliance Drawings SDK before 2021.11 contains a type confusion issue while parsing specially crafted DXF and DWG files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-11927)

• CVE-2021-25178 — CVE-2021-25178 · CWE-121

  Open Design Alliance Drawings SDK before 2021.11 contains a stack-based buffer overflow vulnerability while parsing specially crafted DXF or DWG files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-11901, ZDI-CAN-12165, ZDI-CAN-12166)

• CVE-2021-31784 — CVE-2021-31784 · CWE-787

  Open Design Alliance Drawings SDK before 2021.6 contains an out-of-bounds write issue while parsing specially crafted DXF files. This could result in a write past the end of an allocated buffer and allow an attacker to execute code in the context of the current process. (ZDI-CAN-11915)

• CVE-2021-32936 — CVE-2021-32936 · CWE-787

  Open Design Alliance Drawings SDK before 2022.4 contains an out-of-bounds write issue while parsing specially crafted DXF files. This could result in a write past the end of an allocated buffer and allow an attacker to execute code in the context of the current process. (ZDI-CAN-13408)

• CVE-2021-32938 — CVE-2021-32938 · CWE-125

  Open Design Alliance Drawings SDK before 2022.4 are vulnerable to an out-of-bounds read while parsing specially crafted DWG files. This could allow an attacker to read sensitive information from memory locations and to cause a denial of service (crash). (ZDI-CAN-13378)

• CVE-2021-32940 — CVE-2021-32940 · CWE-125

  Open Design Alliance Drawings SDK before 2022.4 are vulnerable to an out-of-bounds read while parsing specially crafted DWG files. This could allow an attacker to read sensitive information from memory locations and to cause a denial of service. (ZDI-CAN-13412)

• CVE-2021-32944 — CVE-2021-32944 · CWE-416

  Open Design Alliance Drawings SDK before 2021.11 contains a use-after-free vulnerability while parsing specially crafted DGN files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-13468, ZDI-CAN-13413)

• CVE-2021-32946 — CVE-2021-32946 · CWE-754

  Open Design Alliance Drawings SDK before 2022.4 are vulnerable to improper check for unusual or exceptional conditions while parsing specially crafted DGN files. This could allow an attacker to cause a denial-of-service condition or execute code in the context of the current process. (ZDI-CAN-13411, ZDI-CAN-13409)

• CVE-2021-32948 — CVE-2021-32948 · CWE-787

  Open Design Alliance Drawings SDK before 2022.4 contains an out-of-bounds write issue while parsing specially crafted DWG files. This could result in a write past the end of an allocated buffer and allow an attacker to execute code in the context of the current process. (ZDI-CAN-13410)

• CVE-2021-32950 — CVE-2021-32950 · CWE-125

  Open Design Alliance Drawings SDK before 2022.4 are vulnerable to an out-of-bounds read while parsing specially crafted DXF files. This could allow an attacker to read sensitive information from memory locations and to cause a denial of service. (ZDI-CAN-13415)

• CVE-2021-32952 — CVE-2021-32952 · CWE-787

  Open Design Alliance Drawings SDK before 2022.4 contains an out-of-bounds write issue while parsing specially crafted DGN files. This could result in a write past the end of an allocated buffer and allow an attacker to execute code in the context of the current process. (ZDI-CAN-13417)

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.