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Last updated: February 06, 2026

SCWE-021: Unsecured Data Transmission

Stable Version v1.0

This content is in the version-(v1.0) and still under active development, so it is subject to change any time (e.g. structure, IDs, content, URLs, etc.).

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Relationships

  • CWE-319: Cleartext Transmission of Sensitive Information
    CWE-319 Link

Description

Unsecured data transmission refers to the transmission of sensitive information, such as private keys or user data, without encryption. This can lead to: - Interception of sensitive data by malicious actors. - Exploitation of vulnerabilities in the contract. - Loss of funds or data.

Remediation

  • Use encryption: Encrypt sensitive data before transmission.
  • Leverage secure protocols: Use HTTPS or other secure communication protocols.
  • Avoid transmitting sensitive data: Minimize the transmission of sensitive data whenever possible.

Examples

  • Unsecured Data Transmission 

    pragma solidity ^0.8.0;

contract UnsecuredData {
    function transmitData(bytes memory data) public {
        // Transmit data without encryption
    }
}

  • Secured Data Transmission 

    pragma solidity ^0.8.0;

contract SecuredData {
    function transmitData(bytes memory encryptedData) public {
        // Transmit encrypted data
    }
}