# CVE-2018-4920: Memory corruption in Adobe Flash Player 28.0.0.161 and earlier versions

> Type confusion in Adobe Flash Player allows arbitrary code execution, requiring users to upgrade to a patched version.

- **Severity:** High 8.8 (`CVSS:3.1/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:** Yes
- **Published:** 19 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-j5xf-xfvf-pjw6, UBUNTU-CVE-2018-4920

## What is CVE-2018-4920?

CVE-2018-4920 is a high-severity memory corruption vulnerability in Adobe Flash Player, published on 19 May 2018. 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

Adobe Flash Player versions 28.0.0.161 and earlier have an exploitable type confusion vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.

Weakness: CWE-843 (Access of Resource Using Incompatible Type)

## Which versions are affected by CVE-2018-4920?

It affects 2 products.


Products: Adobe Flash Player, Adobe Flash Player Desktop Runtime.

## How do I fix CVE-2018-4920?

Upgrade to a fixed version.

## Is CVE-2018-4920 being exploited?

There is no known exploitation of CVE-2018-4920 in the wild and no public exploit code.

## Other vulnerabilities in Adobe Flash Player

- [CVE-2017-11292](https://insights.sbomify.com/CVE-2017-11292/): Adobe Flash Player Type Confusion (high 8.8, exploited in the wild)
- [CVE-2016-7892](https://insights.sbomify.com/CVE-2016-7892/): Adobe Flash Player Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2016-7855](https://insights.sbomify.com/CVE-2016-7855/): Adobe Flash Player Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2014-0497](https://insights.sbomify.com/CVE-2014-0497/): Adobe Flash Player Integer Underflow Vulnerablity (high 8.8, exploited in the wild)
- [CVE-2013-0643](https://insights.sbomify.com/CVE-2013-0643/): Adobe Flash Player Incorrect Default Permissions (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4920 and fix it if it is affected.

What it is: CVE-2018-4920 is a high-severity memory corruption vulnerability in Adobe Flash Player, published on 19 May 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-4920 in the wild and no public exploit code.

Affected product: Adobe Flash 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-2018-4920/ (Markdown: https://insights.sbomify.com/CVE-2018-4920/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4920
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4920
- OSV: https://osv.dev/vulnerability/CVE-2018-4920

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4920/
Summaries are generated and may contain mistakes; the official description above is the record.