The Apache CGI Source Code Viewing Vulnerability is a type of security vulnerability that affects Apache web servers running Common Gateway Interface (CGI) scripts. This vulnerability can allow attackers to view the source code of CGI scripts, which may contain sensitive information such as passwords, database credentials, or other sensitive data.

The vulnerability occurs when the Apache web server is misconfigured to allow CGI scripts to be executed as text files. This means that instead of executing the script, the server will display the script’s source code in plain text.

To mitigate this vulnerability, you can take the following steps:

1. Disable CGI execution for directories that do not require it: You can disable CGI execution for directories that do not require it by setting the ‘ExecCGI’ option to ‘Off’ in your Apache configuration file.
2. Restrict CGI execution to specific directories: You can restrict CGI execution to specific directories by adding the ‘Options’ directive to your Apache configuration file and setting the ‘ExecCGI’ option to ‘Indexes’.
3. Remove CGI scripts that are not in use: Remove any CGI scripts that are not in use, as they may still be vulnerable to attack even if they are not executed.
4. Update Apache to the latest version: Ensure that your Apache web server is running the latest version to take advantage of any security updates and patches.
5. Use secure coding practices: Ensure that your CGI scripts are developed using secure coding practices to reduce the risk of vulnerabilities.

By following these steps, you can help to reduce the risk of the Apache CGI Source Code Viewing Vulnerability affecting your web server. Additionally, it is recommended that you regularly scan your web server for vulnerabilities using a vulnerability scanner or web application firewall (WAF) to ensure that your server remains secure.