CVE-2021-34323

Code execution via JT parser out-of-bounds write

Published Jul 13, 2021 · Updated Aug 4, 2024

Out-of-bounds write in Siemens JT2Go and Teamcenter Visualization before 13.2 allows attackers to execute code through a crafted JT file. The Jt981.dll JT parser fails to validate user-supplied data before writing past the end of an allocated structure. Exploitation requires a user to open a malicious file or visit a malicious page, and resulting code runs in the current process.

CVSS severity7.8
High
EPSS probability1.73%
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

Out-of-bounds write in Siemens JT2Go and Teamcenter Visualization before 13.2 allows attackers to execute code through a crafted JT file. The Jt981.dll JT parser fails to validate user-supplied data before writing past the end of an allocated structure. Exploitation requires a user to open a malicious file or visit a malicious page, and resulting code runs in the current process.

The record

CVE
CVE-2021-34323
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Teamcenter Visualization
Classifications
CWE-787, CWE-20, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE 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=All versions < V13.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · Teamcenter Visualizationversion=All versions < V13.2
Siemens · JT2Goversion=All versions < V13.2

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8Trend Micro Zero Day InitiativeCVSS: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

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-787Out-of-bounds Write
CWE-20Improper Input Validation
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

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