CEF Validator Online

Validate Common Event Format (CEF) logs for syntax errors, field compliance, and RFC 5424 standards.

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About This Tool

This CEF Validator Online tool allows you to validate Common Event Format logs against the RFC 5424 standard. You can either paste CEF strings directly or upload log files containing CEF entries. The tool checks for proper header format, required fields (Version, Device Vendor, Device Product, Device Version, Signature ID, Name), valid extensions with key-value pairs, and proper escaping. It provides detailed validation results highlighting any errors or warnings with specific line numbers and descriptions.

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How to Use

Enter CEF log data in the text area or click 'Upload CEF File' to select a .txt or .log file.
Click 'Validate CEF' to analyze the CEF content.
View validation results showing syntax status, field compliance, and any errors.
Use 'Clear' to reset the form or 'Download Report' to save results as JSON.

Frequently Asked Questions

Find Quick Answers

What is CEF (Common Event Format)?

CEF is a standardized log format defined in RFC 5424 for interoperability between security and network devices. It uses a specific header structure with required fields and key-value extensions.

What does this validator check?

It validates CEF syntax, checks for required header fields (Version, Device Vendor, Device Product, Device Version, Signature ID, Name), verifies extension format with proper key=value pairs, and ensures proper escaping of special characters.

What file formats are supported for upload?

You can upload plain text files (.txt, .log) containing CEF entries. Each line should contain one CEF log entry starting with 'CEF:'.

Is there a limit on file size or number of lines?

For optimal performance, we recommend files under 1MB or 1000 lines. Larger files may take longer to validate but will still work.

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