CVE-2021-34939

Remote code execution via JT use-after-free

Published Jan 13, 2022 · Updated Aug 4, 2024

Bentley View 10.15.0.75 contains a use-after-free in JT file parsing that allows remote attackers to execute arbitrary code by inducing a user to open a malicious file or visit a malicious page. The parser operates on an object without validating that the object exists before dereferencing it, producing memory corruption in the current process. Exploitation requires user interaction and access to a crafted JT file; successful attacks run with the privileges of Bentley View and can affect confidentiality, integrity, and availability.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Bentley View 10.15.0.75 contains a use-after-free in JT file parsing that allows remote attackers to execute arbitrary code by inducing a user to open a malicious file or visit a malicious page. The parser operates on an object without validating that the object exists before dereferencing it, producing memory corruption in the current process. Exploitation requires user interaction and access to a crafted JT file; successful attacks run with the privileges of Bentley View and can affect confidentiality, integrity, and availability.

The record

CVE
CVE-2021-34939
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
Bentley Systems
Product
Bentley View
Classifications
CWE-416, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

7.8NVDCVSS: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
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
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo