CVE-2021-34920
Description
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley View 10.15.0.75. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of JT files. Crafted data in a JT file can trigger a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-14898.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
A heap buffer overflow in Bentley View's JT file parsing allows remote code execution when a user opens a malicious file.
Vulnerability
The vulnerability is a heap-based buffer overflow in the parsing of JT files within Bentley View 10.15.0.75. Crafted data in a JT file can trigger a write past the end of an allocated buffer. This flaw is part of a larger set of vulnerabilities in MicroStation and MicroStation-based applications [1][2].
Exploitation
An attacker must convince a user to open a malicious JT file or visit a malicious page that triggers the file open. No authentication is required, but user interaction is necessary. The attacker can craft a JT file with specially designed data that causes an out-of-bounds write during parsing [2].
Impact
Successful exploitation allows an attacker to execute arbitrary code in the context of the current process. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability (CVSS 7.8) [1][2].
Mitigation
Bentley released an advisory (BE-2021-0005) on December 7, 2021, recommending users update to the latest version of MicroStation or MicroStation-based applications. For Bentley View, the fix is included in a version later than 10.15.0.75. Users should update to the latest version as per Bentley's advisory [1][2].
AI Insight generated on May 27, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2- Range: = 10.15.0.75
- Bentley/Viewv5Range: 10.15.0.75
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
2- www.bentley.com/en/common-vulnerability-exposure/BE-2021-0005mitrex_refsource_MISC
- www.zerodayinitiative.com/advisories/ZDI-21-1508/mitrex_refsource_MISC
News mentions
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