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CVE-2015-5119 — Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3)…

Key facts

CVE-2015-5119 is a Critical (9.8) vulnerability: Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3)…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2015-5119 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming exploitation in the wild. Federal remediation deadline: 2022-03-24. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2015-5119
Severity Critical (9.8)
CISA KEV Actively exploited (added 2022-03-03)
Detection / prevention —
PoC poc.py
Source 2015/CVE-2015-5119/

Details

English | 한국어

Description

Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3) implementation in Adobe Flash Player 13.x through 13.0.0.296 and 14.x through 18.0.0.194 on Windows and OS X and 11.x through 11.2.202.468 on Linux 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.

Vulnerability Details

Property Value
CVE ID CVE-2015-5119
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2015/CVE-2015-5119/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2015-5119

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • http://blog.trendmicro.com/trendlabs-security-intelligence/unpatched-flash-player-flaws-more-pocs-found-in-hacking-team-leak/
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00015.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00016.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00017.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00018.html
  • http://rhn.redhat.com/errata/RHSA-2015-1214.html
  • http://twitter.com/w3bd3vil/statuses/618168863708962816
  • http://www.kb.cert.org/vuls/id/561288
  • http://www.rapid7.com/db/modules/exploit/multi/browser/adobe_flash_hacking_team_uaf
  • http://www.securityfocus.com/bid/75568
  • http://www.securitytracker.com/id/1032809
  • http://www.us-cert.gov/ncas/alerts/TA15-195A
  • https://helpx.adobe.com/security/products/flash-player/apsa15-03.html
  • https://helpx.adobe.com/security/products/flash-player/apsb15-16.html
  • https://packetstormsecurity.com/files/132600/Adobe-Flash-Player-ByteArray-Use-After-Free.html
  • https://security.gentoo.org/glsa/201507-13
  • http://blog.trendmicro.com/trendlabs-security-intelligence/unpatched-flash-player-flaws-more-pocs-found-in-hacking-team-leak/
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00015.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00016.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00017.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00018.html
  • http://rhn.redhat.com/errata/RHSA-2015-1214.html
  • http://twitter.com/w3bd3vil/statuses/618168863708962816
  • http://www.kb.cert.org/vuls/id/561288
  • http://www.rapid7.com/db/modules/exploit/multi/browser/adobe_flash_hacking_team_uaf
  • http://www.securityfocus.com/bid/75568
  • http://www.securitytracker.com/id/1032809
  • http://www.us-cert.gov/ncas/alerts/TA15-195A
  • https://helpx.adobe.com/security/products/flash-player/apsa15-03.html
  • https://helpx.adobe.com/security/products/flash-player/apsb15-16.html
  • https://packetstormsecurity.com/files/132600/Adobe-Flash-Player-ByteArray-Use-After-Free.html
  • https://security.gentoo.org/glsa/201507-13
  • https://github.com/cisagov/vulnrichment/issues/196
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-5119

Generated by PoC Generator on 2026-07-04T17:41:16.671092785

Frequently asked questions

What is CVE-2015-5119?

CVE-2015-5119 is a Critical (9.8) vulnerability: Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3)…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming active exploitation in the wild.

How do I detect CVE-2015-5119?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2015-5119?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2015-5119 actively exploited?

Yes. CVE-2015-5119 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-03-03, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-03-24. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.