# CVE-2021-33715: Null dereference in JT Utilities

> A race condition in Siemens JT Utilities causes a null pointer dereference when parsing crafted files, leading to application crashes and denial of service.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-3xx5-g4fv-w39v

## What is CVE-2021-33715?

CVE-2021-33715 is a medium-severity vulnerability in Siemens JT Utilities, published on 13 Jul 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been identified in JT Utilities (All versions < V13.0.2.0). When parsing specially crafted JT files, a race condition could cause an object to be released before being operated on, leading to NULL pointer deference condition and causing the application to crash. An attacker could leverage this vulnerability to cause a Denial-of-Service condition in the application.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2021-33715?

It affects 1 product.


Products: Siemens Jt Utilities.

## How do I fix CVE-2021-33715?

No fix has been published for CVE-2021-33715 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33715 being exploited?

There is no known exploitation of CVE-2021-33715 in the wild and no public exploit code.

## Other vulnerabilities in Siemens JT Utilities

- [CVE-2021-33713](https://insights.sbomify.com/CVE-2021-33713/): Denial of service in JT Utilities (medium 5.5)
- [CVE-2021-33714](https://insights.sbomify.com/CVE-2021-33714/): Null dereference in JT Utilities (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33715 and fix it if it is affected.

What it is: CVE-2021-33715 is a medium-severity vulnerability in Siemens JT Utilities, published on 13 Jul 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-33715 in the wild and no public exploit code.

Affected product: Siemens JT Utilities. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-33715/ (Markdown: https://insights.sbomify.com/CVE-2021-33715/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33715
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33715
- OSV: https://osv.dev/vulnerability/CVE-2021-33715

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33715/
Summaries are generated and may contain mistakes; the official description above is the record.