CVE-2021-33715

Application crash via race-driven premature object release

Published Jul 13, 2021 · Updated Aug 3, 2024

NULL pointer dereference in Siemens JT Utilities before 13.0.2.0 allows attackers to crash the application via a crafted JT file. A race during JT parsing releases an object before a later operation uses it, producing a NULL pointer dereference. Exploitation requires a user to open the crafted file, and the reported consequence is an application crash rather than code execution.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Siemens JT Utilities before 13.0.2.0 allows attackers to crash the application via a crafted JT file. A race during JT parsing releases an object before a later operation uses it, producing a NULL pointer dereference. Exploitation requires a user to open the crafted file, and the reported consequence is an application crash rather than code execution.

The record

CVE
CVE-2021-33715
Published
Jul 13, 2021
Updated
Aug 3, 2024
Vendor
Siemens
Product
JT Utilities
Classifications
CWE-476, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=All versions < V13.0.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · JT Utilitiesversion=All versions < V13.0.2.0

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation
T1204.002User Execution: Malicious File

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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