CVE-2021-34921

Code execution via JT buffer overrun

Published Jan 13, 2022 · Updated Aug 4, 2024

Out-of-bounds write in Bentley View 10.15.0.75 allows remote attackers to execute code after a user opens a crafted JT file. The JT parser writes crafted file data past the end of an allocated buffer, corrupting adjacent process memory. Execution requires user interaction and runs with the privileges of the Bentley View process, exposing data and system actions available to that user.

CVSS severity7.8
High
EPSS probability1.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Bentley View 10.15.0.75 allows remote attackers to execute code after a user opens a crafted JT file. The JT parser writes crafted file data past the end of an allocated buffer, corrupting adjacent process memory. Execution requires user interaction and runs with the privileges of the Bentley View process, exposing data and system actions available to that user.

The record

CVE
CVE-2021-34921
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
Bentley View
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 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=10.15.0.75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Bentley Systems · Bentley Viewversion=10.15.0.75

Published CVSS scores

7.8Bentley SystemsCVSS: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.

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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-787Out-of-bounds Write
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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