# CVE-2015-5123: Adobe Flash Player Use-After-Free

> Remote attackers can execute arbitrary code or cause denial of service via crafted Flash content exploiting a use-after-free flaw in Adobe Flash Player.

- **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:** Yes, since 13 Apr 2022 (CISA KEV)
- **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:** 14 Jul 2015
- **Updated:** 17 Nov 2025
- **Also known as:** GHSA-6hpg-rw47-66vr, UBUNTU-CVE-2015-5123

## What is CVE-2015-5123?

CVE-2015-5123 is a high-severity use after free vulnerability in Adobe Flash Player, published on 14 Jul 2015. 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

Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3) implementation in Adobe Flash Player 13.x through 13.0.0.302 on Windows and OS X, 14.x through 18.0.0.203 on Windows and OS X, 11.x through 11.2.202.481 on Linux, and 12.x through 18.0.0.204 on Linux Chrome installations allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted Flash content that overrides a valueOf function, as exploited in the wild in July 2015.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2015-5123?

It affects 9 products.


Products: Adobe Flash Player, Adobe Flash Player Desktop Runtime, Opensuse Evergreen, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Eus, Redhat Enterprise Linux Workstation, Suse Linux Enterprise Desktop, Suse Linux Enterprise Workstation Extension.

## How do I fix CVE-2015-5123?

Apply the vendor's patch. US federal agencies must fix it by 4 May 2022.

## Is CVE-2015-5123 being exploited?

Yes. Attackers have exploited CVE-2015-5123 in the wild since at least 13 Apr 2022.

## 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-2015-5123 and fix it if it is affected.

What it is: CVE-2015-5123 is a high-severity use after free vulnerability in Adobe Flash Player, published on 14 Jul 2015. 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: Yes. Attackers have exploited CVE-2015-5123 in the wild since at least 13 Apr 2022.

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-2015-5123/ (Markdown: https://insights.sbomify.com/CVE-2015-5123/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-5123
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-5123
- OSV: https://osv.dev/vulnerability/CVE-2015-5123

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From sbomify Insights: https://insights.sbomify.com/CVE-2015-5123/
Summaries are generated and may contain mistakes; the official description above is the record.