CVE-2021-46638: 
Bentley MicroStation CONNECT vulnerability analysis and mitigation

This vulnerability (CVE-2021-46638) affects Bentley MicroStation CONNECT version 10.16.0.80. The vulnerability allows remote attackers to execute arbitrary code on affected installations. User interaction is required to exploit this vulnerability, as the target must visit a malicious page or open a malicious file. The vulnerability was discovered by Mat Powell of Trend Micro Zero Day Initiative and was disclosed on January 31, 2022 (Zero Day Initiative, Bentley Advisory).

The specific flaw exists within the parsing of DGN files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (HIGH) with the following vector: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (Zero Day Initiative).

An attacker can leverage this vulnerability to execute code in the context of the current process. The vulnerability affects the confidentiality, integrity, and availability of the system with high impact levels (Zero Day Initiative).

Bentley has released version 10.16.02.* and more recent versions to address this vulnerability. As a general best practice, it is recommended to only open DGN files coming from trusted sources (Bentley Advisory).