# CVE-2021-27496: Null dereference in Datakit Software libraries embedded in Luxion KeyShot software

> Attackers can execute arbitrary code by tricking users into opening malicious PRT files in KeyShot due to improper validation in Datakit libraries.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:** 27 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-gq8r-8wxg-m3x5

## What is CVE-2021-27496?

CVE-2021-27496 is a high-severity vulnerability in Datakit Software libraries embedded in Luxion KeyShot software, published on 27 May 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

Datakit Software libraries CatiaV5_3dRead, CatiaV6_3dRead, Step3dRead, Ug3dReadPsr, Jt3dReadPsr modules in KeyShot Versions v10.1 and prior lack proper validation of user-supplied data when parsing PRT files. This could lead to pointer dereferences of a value obtained from an untrusted source. An attacker could leverage this vulnerability to execute code in the context of the current process.

Weakness: CWE-822 (Untrusted Pointer Dereference)

## Which versions are affected by CVE-2021-27496?

It affects 4 products.


Products: Datakit Crosscadware, Luxion Keyshot, Siemens Solid Edge Se2020 Firmware, Siemens Solid Edge Se2021 Firmware.

## How do I fix CVE-2021-27496?

No fix has been published for CVE-2021-27496 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27496 being exploited?

There is no known exploitation of CVE-2021-27496 in the wild and no public exploit code.

## Other vulnerabilities in Datakit Software libraries embedded in Luxion KeyShot software

- [CVE-2023-23579](https://insights.sbomify.com/CVE-2023-23579/): Datakit CrossCAD/Ware (high 7.8)
- [CVE-2021-27488](https://insights.sbomify.com/CVE-2021-27488/): Memory corruption in Datakit Software libraries embedded in Luxion KeyShot software (high 7.8)
- [CVE-2021-27490](https://insights.sbomify.com/CVE-2021-27490/): Memory corruption in Datakit Software libraries embedded in Luxion KeyShot software (high 7.8)
- [CVE-2021-27494](https://insights.sbomify.com/CVE-2021-27494/): Memory corruption in Datakit Software libraries embedded in Luxion KeyShot software (high 7.8)
- [CVE-2021-27492](https://insights.sbomify.com/CVE-2021-27492/): XML external entity in Datakit Software libraries embedded in Luxion KeyShot software (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27496 and fix it if it is affected.

What it is: CVE-2021-27496 is a high-severity vulnerability in Datakit Software libraries embedded in Luxion KeyShot software, published on 27 May 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-2021-27496 in the wild and no public exploit code.

Affected product: Datakit Software libraries embedded in Luxion KeyShot software. 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-2021-27496/ (Markdown: https://insights.sbomify.com/CVE-2021-27496/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27496
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27496
- OSV: https://osv.dev/vulnerability/CVE-2021-27496

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27496/
Summaries are generated and may contain mistakes; the official description above is the record.