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

Source: https://junglewise.ai/threats/cve-2015-5123-adobe-flash-player-use-after-free-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-04-13. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2015-5123 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-04-13

A use-after-free vulnerability exists in the BitmapData class within the ActionScript 3 (AS3) implementation of Adobe Flash Player. Remote attackers can exploit this by using crafted Flash content that overrides the valueOf function, leading to arbitrary code execution or denial of service.

Technologies: [Adobe AIR](https://junglewise.ai/threats/technologies/air), [Adobe Flash Player](https://junglewise.ai/threats/technologies/flash-player). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe).

## Quick answers

**Is CVE-2015-5123 exploited in the wild?** Yes. CVE-2015-5123 is known to be exploited in the wild, first recorded on 13 April 2022. Treat it as urgent.

**How severe is CVE-2015-5123?** Critical severity, with a CVSS score of 9.8, published 13 April 2022.

**Which products and versions are affected?** 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.

**Is there a fix for CVE-2015-5123?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2015-5123 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2015-5123?** Check whether you run Adobe AIR or Adobe Flash Player. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- 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

## Timeline

- 2015-07: exploited: Exploited in the wild as a zero-day following the Hacking Team leak.
- 2022-04-13: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.

## Related threats

- [Adobe Acrobat use-after-free in PDF parsing](https://junglewise.ai/threats/cve-2020-9715-adobe-acrobat-use-after-free-in-pdf-parsing)
- [Adobe Acrobat and Reader prototype pollution in JavaScript engine](https://junglewise.ai/threats/cve-2026-34621-adobe-acrobat-and-reader-prototype-pollution-in-javascript-engine)
- [Adobe Flash Player Incorrect Default Permissions Vulnerability](https://junglewise.ai/threats/cve-2013-0643-adobe-flash-player-incorrect-default-permissions-vulnerability)
- [Adobe Flash Player Integer Underflow Vulnerablity](https://junglewise.ai/threats/cve-2014-0497-adobe-flash-player-integer-underflow-vulnerablity)
- [Adobe Flash Player Double Free Vulnerablity](https://junglewise.ai/threats/cve-2014-0502-adobe-flash-player-double-free-vulnerablity)