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CVE-2014-4123 — Microsoft Internet Explorer 7 through 11 allows remote attackers to gain privileges via a…

Key facts

CVE-2014-4123 is a High (8.8) vulnerability: Microsoft Internet Explorer 7 through 11 allows remote attackers to gain privileges via a…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-05-25), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2014-4123 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-05-25), confirming exploitation in the wild. Federal remediation deadline: 2022-06-15. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2014-4123
Severity High (8.8)
CISA KEV Actively exploited (added 2022-05-25)
Detection / prevention —
PoC poc.py
Source 2014/CVE-2014-4123/

Details

English | 한국어

Description

Microsoft Internet Explorer 7 through 11 allows remote attackers to gain privileges via a crafted web site, aka "Internet Explorer Elevation of Privilege Vulnerability," as exploited in the wild in October 2014, a different vulnerability than CVE-2014-4124.

Vulnerability Details

Property Value
CVE ID CVE-2014-4123
CVSS Score 8.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2014/CVE-2014-4123/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-2014-4123

# 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/2014/10/14/accessing-risk-for-the-october-2014-security-updates.aspx
  • http://secunia.com/advisories/60968
  • http://www.securityfocus.com/bid/70326
  • http://www.securitytracker.com/id/1031018
  • https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-056
  • http://blogs.technet.com/b/srd/archive/2014/10/14/accessing-risk-for-the-october-2014-security-updates.aspx
  • http://secunia.com/advisories/60968
  • http://www.securityfocus.com/bid/70326
  • http://www.securitytracker.com/id/1031018
  • https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-056
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-4123

Generated by PoC Generator on 2026-07-11T13:05:41.895695042

Frequently asked questions

What is CVE-2014-4123?

CVE-2014-4123 is a High (8.8) vulnerability: Microsoft Internet Explorer 7 through 11 allows remote attackers to gain privileges via a…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-05-25), confirming active exploitation in the wild.

How do I detect CVE-2014-4123?

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-2014-4123?

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-2014-4123 actively exploited?

Yes. CVE-2014-4123 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-05-25, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-06-15. Prioritise patching and deploy the detection and prevention rules above.

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