The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3021 advisory.

    Manfred Paul discovered two security issues in the Mozilla Firefox web browser, which could result in the     execution of arbitrary code. For Debian 9 stretch, these problems have been fixed in version     91.9.1esr-1~deb9u1. We recommend that you upgrade your firefox-esr packages. For the detailed security     status of firefox-esr please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/firefox-esr 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 these issues but has instead relied only on the application's self-reported version number.

Detections

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Debian DLA-3021-1 : firefox-esr - LTS security update

high Nessus Plugin ID 161463

Version 1.7