Avast Internet Security 21.5.6354 is a comprehensive and intelligent security suite designed to offer advanced online protection for Windows users. Released as part of Avast’s robust antivirus lineup, this version combines traditional antivirus, smart firewall, anti-phishing tools, and web protection into a seamless, user-friendly package.
Whether you’re browsing, shopping, or banking online, this version enhances both cybersecurity and performance.
Key Enhancements:
- Smarter Malware Engine
Enhanced AI-powered engine for real-time detection of zero-day threats and rootkits. - Improved Firewall
Better app behavior control and network activity visibility for blocking suspicious connections. - More Accurate Phishing Protection
Enhanced detection of fake websites and emails. - Faster Scans & Boot-time Optimization
Significant reduction in scan duration and background system load. - Silent App & Virus Updates
Smarter scheduling and silent mode support.
Key Features of Avast Internet Security 21.5.6354
| Feature | Description |
| Real-Time Protection | Scans and blocks malware, spyware, and ransomware before it executes. |
| Advanced Firewall | Monitors network traffic and blocks unauthorized access. |
| Web & Email Shield | Protects against malicious websites and phishing emails. |
| Sandbox Mode | Run suspicious apps in a virtual environment to prevent system damage. |
| Wi-Fi Inspector | Scans your home network for vulnerabilities and unauthorized devices. |
| Ransomware Shield | Block apps from modifying or encrypting sensitive files without permission. |
| Anti-Spam Filter | Filters out phishing and junk emails (for email clients like Outlook or Thunderbird). |
| Real Site (DNS Protection) | Prevents DNS hijacking by ensuring you connect to real, legitimate websites. |
| Do Not Disturb Mode | Silences notifications while gaming, streaming, or working full-screen. |
System Requirements
| Component | Minimum Requirement |
| OS Support | Windows 7 SP1, 8.1, 10, 11 (32-bit or 64-bit) |
| RAM | 1 GB minimum (2 GB recommended) |
| Disk Space | 2 GB free disk space |
| CPU | Intel Pentium 4 / AMD Athlon 64 or newer |
| Internet | Required for activation, updates, and scanning |
Who Is It For?
Avast Internet Security is ideal for:
- Home users who need solid protection without a complex setup
- Small businesses needing extra layers beyond free antivirus
- Remote workers require a strong network and ransomware protection
- Families using shared PCs and home Wi-Fi networks
Comparison: Avast Free vs Internet Security vs Premium
| Feature | Free Antivirus | Internet Security | Premium Security |
| Antivirus & Malware Protection | ✅ Yes | ✅ Yes | ✅ Yes |
| Web & Email Shield | ✅ Yes | ✅ Yes | ✅ Yes |
| Firewall | ❌ No | ✅ Yes | ✅ Yes |
| Sandbox | ❌ No | ✅ Yes | ✅ Yes |
| Ransomware Shield | ❌ No | ✅ Yes | ✅ Yes |
| Real Site Protection (DNS) | ❌ No | ✅ Yes | ✅ Yes |
| VPN (SecureLine) | ❌ No | ❌ No | ✅ Yes |
| Anti-Tracking & Webcam Shield | ❌ No | ❌ No | ✅ Yes |
Pricing (as of 2025)
| Plan | Devices | Duration | Price (Approx.) |
| Internet Security – 1 PC | 1 | 1 Year | $49.99 |
| Internet Security – 3 PCs | 3 | 1 Year | $69.99 |
| Premium Security – 10 PCs | 10 | 1 Year | $89.99 |
A Note on Cracked Versions
Some users search for “Avast Internet Security 21.5.6354 crack” or “license key generators.” While these may seem like free shortcuts, they come with serious risks:
- Malware infection: Crack files often include Trojans, keyloggers, and ransomware.
- No updates or support: You’ll be vulnerable to new threats.
- Legal issues: Using pirated software is illegal in most countries.
- Feature loss: Cracked versions often disable advanced protection modules.
Instead, consider using the free version legally or a trial of the full version, and upgrade when needed.
Final Verdict
Avast Internet Security 21.5.6354 delivers well-rounded protection with a smart firewall, anti-ransomware shield, and real-time defenses that cover both online and offline threats. It’s a significant upgrade from free antivirus solutions and is perfect for anyone who wants more control over their security without slowing down their PC.