CVE-2021-46575

Remote code execution via DGN use-after-free

Published Feb 18, 2022 · Updated Aug 4, 2024

A use-after-free in Bentley MicroStation CONNECT 10.16.0.80 allows remote attackers to execute arbitrary code via a malicious DGN file. The DGN parser performs operations on an object without validating that the object exists, enabling code execution in the current process when the file is opened. Exploitation requires user interaction to open the crafted file or visit a page that causes it to be opened; the resulting process runs with the user's privileges.

CVSS severity7.8
High
EPSS probability2.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Bentley MicroStation CONNECT 10.16.0.80 allows remote attackers to execute arbitrary code via a malicious DGN file. The DGN parser performs operations on an object without validating that the object exists, enabling code execution in the current process when the file is opened. Exploitation requires user interaction to open the crafted file or visit a page that causes it to be opened; the resulting process runs with the user's privileges.

The record

CVE
CVE-2021-46575
Published
Feb 18, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
MicroStation
Classifications
CWE-416, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.16.0.80

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Bentley Systems · MicroStationversion=10.16.0.80

Published CVSS scores

7.8Trend Micro ZDICVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1204.002Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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