The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5470 advisory.

  - Werkzeug is a comprehensive WSGI web application library. Browsers may allow nameless cookies that look     like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an     adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug     prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is     running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser,     the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in     Werkzeug 2.2.3. (CVE-2023-23934)

  - Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart     form data parser will parse an unlimited number of parts, including file parts. Parts can be a small     amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request     can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or     `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. This allows an     attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it.
    The amount of CPU time required can block worker processes from handling legitimate requests. The amount     of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory     and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all     available workers. Version 2.2.3 contains a patch for this issue. (CVE-2023-25577)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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Debian DSA-5470-1 : python-werkzeug - security update

low Nessus Plugin ID 179394

Version 1.0