# CVE-2019-19721: Memory corruption in n/a

> Remote attackers can cause denial of service via memory corruption in VLC media player by exploiting an off-by-one error with a crafted image file.

- **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:** Yes
- **Published:** 15 May 2020
- **Updated:** 8 Oct 2026
- **Also known as:** DEBIAN-CVE-2019-19721, GHSA-2wrf-hf7j-cx32, UBUNTU-CVE-2019-19721

## What is CVE-2019-19721?

CVE-2019-19721 is a high-severity memory corruption vulnerability in Videolan Vlc Media Player, published on 15 May 2020. 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

An off-by-one error in the DecodeBlock function in codec/sdl_image.c in VideoLAN VLC media player before 3.0.9 allows remote attackers to cause a denial of service (memory corruption) via a crafted image file. NOTE: this may be related to the SDL_Image product.

Weakness: CWE-787 (Out-of-bounds Write), CWE-193 (Off-by-one Error)

## Which versions are affected by CVE-2019-19721?

It affects 1 product.


Products: Videolan Vlc Media Player.

## How do I fix CVE-2019-19721?

Upgrade to a fixed version.

## Is CVE-2019-19721 being exploited?

There is no known exploitation of CVE-2019-19721 in the wild and no public exploit code.

## Other vulnerabilities in Videolan Vlc Media Player

- [CVE-2008-0296](https://insights.sbomify.com/CVE-2008-0296/): Memory corruption in n/a (critical 10.0)
- [CVE-2023-47359](https://insights.sbomify.com/CVE-2023-47359/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-12874](https://insights.sbomify.com/CVE-2019-12874/): Use after free in n/a (critical 9.8)
- [CVE-2017-10699](https://insights.sbomify.com/CVE-2017-10699/): Memory corruption in n/a (critical 9.8)
- [CVE-2013-1868](https://insights.sbomify.com/CVE-2013-1868/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19721 and fix it if it is affected.

What it is: CVE-2019-19721 is a high-severity memory corruption vulnerability in Videolan Vlc Media Player, published on 15 May 2020. 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-2019-19721 in the wild and no public exploit code.

Affected product: Videolan Vlc Media Player. 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-2019-19721/ (Markdown: https://insights.sbomify.com/CVE-2019-19721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19721
- OSV: https://osv.dev/vulnerability/CVE-2019-19721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19721/
Summaries are generated and may contain mistakes; the official description above is the record.