CVE-2021-46613

Code execution via DXF parser use-after-free

Published Feb 18, 2022 · Updated Aug 4, 2024

Use-after-free in Bentley Systems MicroStation 10.16.0.80 allows remote attackers to execute code via a crafted DXF file. The DXF parser operates on an object without first validating that the object still exists, triggering a use-after-free. The target must visit a malicious page or open the file; successful exploitation runs code in the current MicroStation process.

CVSS severity7.8
High
EPSS probability2.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Bentley Systems MicroStation 10.16.0.80 allows remote attackers to execute code via a crafted DXF file. The DXF parser operates on an object without first validating that the object still exists, triggering a use-after-free. The target must visit a malicious page or open the file; successful exploitation runs code in the current MicroStation process.

The record

CVE
CVE-2021-46613
Published
Feb 18, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
MicroStation
Classifications
CWE-416, T1203, T1204.002
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

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8Bentley SystemsCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV: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.

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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
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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