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CVE-2015-5123 — Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3)…

Key facts

CVE-2015-5123 is a Critical (9.8) vulnerability: Use-after-free vulnerability in the BitmapData 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 2022-04-13), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2015-5123 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-04-13), confirming exploitation in the wild. Federal remediation deadline: 2022-05-04. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2015-5123
Severity Critical (9.8)
CISA KEV Actively exploited (added 2022-04-13)
Detection / prevention —
PoC poc.py
Source 2015/CVE-2015-5123/

Details

English | 한국어

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.

Vulnerability Details

Property Value
CVE ID CVE-2015-5123
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2015/CVE-2015-5123/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-2015-5123

# 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/new-zero-day-vulnerability-cve-2015-5123-in-adobe-flash-emerges-from-hacking-team-leak/
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00028.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00029.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00032.html
  • http://marc.info/?l=bugtraq&m=144050155601375&w=2
  • http://rhn.redhat.com/errata/RHSA-2015-1235.html
  • http://www.kb.cert.org/vuls/id/918568
  • http://www.securityfocus.com/bid/75710
  • http://www.securitytracker.com/id/1032890
  • http://www.us-cert.gov/ncas/alerts/TA15-195A
  • https://h20564.www2.hp.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04796784
  • https://helpx.adobe.com/security/products/flash-player/apsa15-04.html
  • https://helpx.adobe.com/security/products/flash-player/apsb15-18.html
  • https://security.gentoo.org/glsa/201508-01
  • http://blog.trendmicro.com/trendlabs-security-intelligence/new-zero-day-vulnerability-cve-2015-5123-in-adobe-flash-emerges-from-hacking-team-leak/
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00028.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00029.html
  • http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00032.html
  • http://marc.info/?l=bugtraq&m=144050155601375&w=2
  • http://rhn.redhat.com/errata/RHSA-2015-1235.html
  • http://www.kb.cert.org/vuls/id/918568
  • http://www.securityfocus.com/bid/75710
  • http://www.securitytracker.com/id/1032890
  • http://www.us-cert.gov/ncas/alerts/TA15-195A
  • https://h20564.www2.hp.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04796784
  • https://helpx.adobe.com/security/products/flash-player/apsa15-04.html
  • https://helpx.adobe.com/security/products/flash-player/apsb15-18.html
  • https://security.gentoo.org/glsa/201508-01
  • https://github.com/cisagov/vulnrichment/issues/196
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-5123

Generated by PoC Generator on 2026-07-04T17:10:59.899350661

Frequently asked questions

What is CVE-2015-5123?

CVE-2015-5123 is a Critical (9.8) vulnerability: Use-after-free vulnerability in the BitmapData 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 2022-04-13), confirming active exploitation in the wild.

How do I detect CVE-2015-5123?

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-2015-5123?

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-2015-5123 actively exploited?

Yes. CVE-2015-5123 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-04-13, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-05-04. Prioritise patching and deploy the detection and prevention rules above.

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