# CVE-2021-40417: Integer overflow in Blackmagic Design

> An integer overflow in the DPDecoder service allows attackers to trigger a heap buffer overflow and execute arbitrary code via a crafted video file.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 22 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-9g9g-w89w-6r9g

## What is CVE-2021-40417?

CVE-2021-40417 is a critical vulnerability in Blackmagic Design, published on 22 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

When parsing a file that is submitted to the DPDecoder service as a job, the service will use the combination of decoding parameters that were submitted with the job along with fields that were parsed for the submitted video by the R3D SDK to calculate the size of a heap buffer. Due to an integer overflow with regards to this calculation, this can result in an undersized heap buffer being allocated. When this heap buffer is written to, a heap-based buffer overflow will occur. This can result in code execution under the context of the application.

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

## Which versions are affected by CVE-2021-40417?

It affects 1 product.


Products: Blackmagicdesign Davinci Resolve.

## How do I fix CVE-2021-40417?

No fix has been published for CVE-2021-40417 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-40417 being exploited?

There is no known exploitation of CVE-2021-40417 in the wild and no public exploit code.

## Other vulnerabilities in Blackmagic Design

- [CVE-2021-40418](https://insights.sbomify.com/CVE-2021-40418/): Use after free in Blackmagic Design (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40417 and fix it if it is affected.

What it is: CVE-2021-40417 is a critical vulnerability in Blackmagic Design, published on 22 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-40417 in the wild and no public exploit code.

Affected product: Blackmagic Design. 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-2021-40417/ (Markdown: https://insights.sbomify.com/CVE-2021-40417/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40417
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40417
- OSV: https://osv.dev/vulnerability/CVE-2021-40417

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-40417/
Summaries are generated and may contain mistakes; the official description above is the record.