UNKNOWN CVSS 9.3
Published: 1999-10-21

CVE-1999-0766

microsoft internet_explorer Security Advisory (CVE-1999-0766)
↗ Official NIST NVD Record
Seeking technical exploit breakdowns or verified PoC code for CVE-1999-0766?
🔬 Search Writeups & Exploit Archive →

CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-1999-0766 impacting microsoft internet_explorer. Evaluated with CVSS Base Score of 9.3 (UNKNOWN).

Original NVD Description

Source: NIST NVD
The Microsoft Java Virtual Machine allows a malicious Java applet to execute arbitrary commands outside of the sandbox environment.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries

🎯 Affected Versions Matrix

Affected Product microsoft / internet_explorer
Affected Versions 6.0.2900
Weakness Enumeration CWE-16

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-1999-0766 impacting microsoft internet_explorer.

⚡ Nuclei Detection Template (YAML) cve-1999-0766.yaml
id: cve-1999-0766

info:
  name: microsoft internet_explorer - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: unknown
  description: |
    Automated signature & scanner for CVE-1999-0766 affecting microsoft internet_explorer.
    Evaluation: The Microsoft Java Virtual Machine allows a malicious Java applet to execute arbitrary commands outside of the sandbox environment....
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-1999-0766
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:M/Au:N/C:C/I:C/A:C
    cvss-score: 9.3
    cve-id: CVE-1999-0766
    cwe-id: CWE-16
  tags: cve,cve-1999-0766,microsoft,internet_explorer,unknown

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "internet_explorer"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-1999-0766.py
# Proof-of-Concept Exploit & Verification Probe for CVE-1999-0766
# Target: microsoft internet_explorer | CVSS: 9.3 (UNKNOWN)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-1999-0766 (microsoft internet_explorer)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against microsoft internet_explorer scope (6.0.2900).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-1999-0766.sh
# Recommended Remediation & Patching Commands for CVE-1999-0766
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install internet_explorer 2>/dev/null || \
sudo dnf upgrade internet_explorer 2>/dev/null || \
sudo yum update internet_explorer

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i internet_explorer 2>/dev/null || rpm -qa | grep -i internet_explorer

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-1999-0766 in microsoft internet_explorer?

Review vendor-specific security notices and update microsoft internet_explorer packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-1999-0766?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-1999-0766?

CVE-1999-0766 is classified with a CVSS 3.1 Base Score of 9.3 (UNKNOWN). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
9.3
UNKNOWN SEVERITY
CVE ID CVE-1999-0766
Weakness CWE-16
Vendor microsoft
Product internet_explorer
Published 1999-10-21
Vector AV:N/AC:M/Au:N/C:C/I:C/A:C