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CVE-2014-1776 — Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote…

Key facts

CVE-2014-1776 is a Critical (9.8) vulnerability: Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-28), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2014-1776 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-28), confirming exploitation in the wild. Federal remediation deadline: 2022-07-28. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2014-1776
Severity Critical (9.8)
CISA KEV Actively exploited (added 2022-01-28)
Detection / prevention —
PoC poc.py
Source 2014/CVE-2014-1776/

Details

English | 한국어

Description

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."

Vulnerability Details

Property Value
CVE ID CVE-2014-1776
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2014/CVE-2014-1776/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-2014-1776

# 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://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
  • http://secunia.com/advisories/57908
  • http://securitytracker.com/id?1030154
  • http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html
  • http://www.kb.cert.org/vuls/id/222929
  • http://www.osvdb.org/106311
  • http://www.securityfocus.com/bid/67075
  • http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
  • https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
  • https://technet.microsoft.com/library/security/2963983
  • http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
  • http://secunia.com/advisories/57908
  • http://securitytracker.com/id?1030154
  • http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html
  • http://www.kb.cert.org/vuls/id/222929
  • http://www.osvdb.org/106311
  • http://www.securityfocus.com/bid/67075
  • http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
  • https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
  • https://technet.microsoft.com/library/security/2963983
  • https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script
  • https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776

Generated by PoC Generator on 2026-07-05T00:28:51.872724928

Frequently asked questions

What is CVE-2014-1776?

CVE-2014-1776 is a Critical (9.8) vulnerability: Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-28), confirming active exploitation in the wild.

How do I detect CVE-2014-1776?

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-2014-1776?

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-2014-1776 actively exploited?

Yes. CVE-2014-1776 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-01-28, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-07-28. Prioritise patching and deploy the detection and prevention rules above.

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