CVE-2021-46605

Code execution via BMP heap buffer overflow

Published Feb 18, 2022 · Updated Aug 4, 2024

Heap-based buffer overflow in Bentley Systems MicroStation 10.16.0.80 allows remote attackers to execute code via a crafted BMP file. Its BMP parser fails to validate a user-controlled length before copying image data into a heap buffer, allowing the copy to overrun that allocation. Exploitation requires a user to visit a malicious page or open a crafted file, and successful execution runs with the current process's privileges.

CVSS severity7.8
High
EPSS probability2.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Bentley Systems MicroStation 10.16.0.80 allows remote attackers to execute code via a crafted BMP file. Its BMP parser fails to validate a user-controlled length before copying image data into a heap buffer, allowing the copy to overrun that allocation. Exploitation requires a user to visit a malicious page or open a crafted file, and successful execution runs with the current process's privileges.

The record

CVE
CVE-2021-46605
Published
Feb 18, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
MicroStation
Classifications
CWE-122, 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

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

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-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

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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