CVE-2021-34891

Code execution via JT parser use-after-free

Published Jan 13, 2022 · Updated Aug 4, 2024

Use-after-free in JT file parsing in Bentley Systems Bentley View 10.15.0.75 allows remote attackers to execute code via a crafted file. The parser fails to verify that an object still exists before operating on it, permitting reuse of freed memory during JT processing. Execution requires the target to visit a malicious page or open a malicious JT file, and resulting code runs in the current process context.

CVSS severity7.8
High
EPSS probability2.05%
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 JT file parsing in Bentley Systems Bentley View 10.15.0.75 allows remote attackers to execute code via a crafted file. The parser fails to verify that an object still exists before operating on it, permitting reuse of freed memory during JT processing. Execution requires the target to visit a malicious page or open a malicious JT file, and resulting code runs in the current process context.

The record

CVE
CVE-2021-34891
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
Bentley View
Classifications
CWE-416, T1203, T1204.002
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?

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  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

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
T1204.002Malicious 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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