The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2991 advisory.

    The Twisted Web HTTP 1.1 server, located in the twisted.web.http module, parsed several HTTP request     constructs more leniently than permitted by RFC 7230. This non-conformant parsing can lead to desync if     requests pass through multiple HTTP parsers, potentially resulting in HTTP request smuggling. For Debian 9     stretch, this problem has been fixed in version 16.6.0-2+deb9u3. We recommend that you upgrade your     twisted packages. For the detailed security status of twisted please refer to its security tracker page     at: https://security-tracker.debian.org/tracker/twisted Further information about Debian LTS security     advisories, how to apply these updates to your system and frequently asked questions can be found at:
    https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

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Debian DLA-2991-1 : twisted - LTS security update

high Nessus Plugin ID 160979

Version 1.3