Unauthenticated attackers can read arbitrary files outside the web root. Technical Deep Dive
Python's pickle module is inherently unsafe for deserializing untrusted data. This is a well-known fact in the security community. If a WSGI application (regardless of the server version) uses pickle to deserialize a cookie or other user-supplied data without validation, it creates a critical vulnerability. wsgiserver 02 cpython 3104 exploit
If the wsgiserver passes these variables unsanitized to an application that processes data using vulnerable CPython 3.10.4 standard library modules (such as certain configurations of pickle , ctypes , or older regex engines prone to ReDoS), an attacker can achieve Remote Code Execution. If a WSGI application (regardless of the server
One real-world example comes from an OSCP penetration testing walkthrough. An nmap scan of a target machine revealed the exact header: WSGIServer/0.2 CPython/3.10.6 . From this initial information, the tester was able to ultimately gain shell access to the system by exploiting known vulnerabilities in the application running on that server. An nmap scan of a target machine revealed
The banner exposes a web server running a Python Web Server Gateway Interface (WSGI) stack that is highly susceptible to Directory Traversal (CVE-2021-40978) and Remote Code Execution (RCE) vulnerabilities. When security tools or CTF platforms like OffSec's Proving Grounds flag this exact signature, it typically points to an unpatched development server (such as MkDocs 1.2.2 or an old Werkzeug/Gevent implementation) misconfigured to face the public internet.
This is a very common "exploit chain" that connects directly to the WSGIServer/0.2 CPython/3.10.4 banner. Gerapy is a distributed crawler management framework built with Django. Older versions (prior to 0.9.8) use the wsgiref.simple_server for development and are vulnerable to , an authenticated Remote Code Execution (RCE) .