CVE-2020-15101: 
Python vulnerability analysis and mitigation

In freewvs before version 0.1.1, a vulnerability was discovered that could allow a directory structure of more than 1000 nested directories to interrupt a freewvs scan. The issue was identified and disclosed on July 6, 2020, and was assigned CVE-2020-15101. This vulnerability affects the directory scanning functionality of the freewvs application (GitHub Advisory).

The vulnerability occurs due to Python's recursion limit when using os.walk() function to scan directories. When encountering a directory structure with more than 1000 nested directories, the scan process would be interrupted. This limitation in the directory traversal mechanism could be exploited in scenarios where an administrator scans directories of potentially untrusted users (GitHub Advisory).

The primary impact of this vulnerability is a potential denial of service condition where the scanning process would be interrupted when encountering deeply nested directory structures. This could be particularly problematic in environments where administrators need to scan directories containing untrusted user content (GitHub Advisory).

The vulnerability can be triggered by creating a directory structure with more than 1000 nested directories. This could be exploited in scenarios where untrusted users have the ability to create directory structures that will be scanned by the freewvs tool (GitHub Advisory).

The issue has been fixed in version 0.1.1 by implementing a limit of 500 on directory recursion depth. The fix was implemented through a commit that modifies the directory traversal logic to prevent excessive recursion (GitHub Commit).