# CVE-2020-6099: Memory corruption in BIMx Desktop Viewer

> A heap buffer overflow in Graphisoft BIMx Desktop Viewer allows remote code execution via a specially crafted file.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/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:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Apr 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-7g8j-9jf2-66wx

## What is CVE-2020-6099?

CVE-2020-6099 is a high-severity memory corruption vulnerability in Graphisoft BIMx Desktop Viewer, published on 18 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An exploitable code execution vulnerability exists in the file format parsing functionality of Graphisoft BIMx Desktop Viewer 2019.2.2328. A specially crafted file can cause a heap buffer overflow resulting in a code execution. An attacker can provide a malicious file to trigger this vulnerability.

Weakness: CWE-190 (Integer Overflow or Wraparound), CWE-680 (Integer Overflow to Buffer Overflow)

## Which versions are affected by CVE-2020-6099?

It affects 1 product.


Products: Graphisoft Bimx Desktop Viewer.

## How do I fix CVE-2020-6099?

No fix has been published for CVE-2020-6099 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-6099 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-6099 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6099 and fix it if it is affected.

What it is: CVE-2020-6099 is a high-severity memory corruption vulnerability in Graphisoft BIMx Desktop Viewer, published on 18 Apr 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-6099 exists.

Affected product: Graphisoft BIMx Desktop Viewer. 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-2020-6099/ (Markdown: https://insights.sbomify.com/CVE-2020-6099/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6099
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6099
- OSV: https://osv.dev/vulnerability/CVE-2020-6099

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-6099/
Summaries are generated and may contain mistakes; the official description above is the record.