The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2880-1 advisory.

    Bob Clary, Christian Holler, Nils Ohlmeier, Gary Kwong, Jesse Ruderman, Carsten Book, Randell Jesup,     Nicolas Pierron, Eric Rescorla, Tyson Smith, and Gabor Krizsanits discovered multiple memory safety issues     in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could     potentially exploit these to cause a denial of service via application crash, or execute arbitrary code     with the privileges of the user invoking Firefox. (CVE-2016-1930, CVE-2016-1931)

    Gustavo Grieco discovered an out-of-memory crash when loading GIF images in some circumstances. If a user     were tricked in to opening a specially crafted website, an attacker could exploit this to cause a denial     of service. (CVE-2016-1933)

    Aki Helin discovered a buffer overflow when rendering WebGL content in some circumstances. If a user were     tricked in to opening a specially crafted website, an attacker could potentially exploit this to cause a     denial of service via application crash, or execute arbitrary code with the privileges of the user     invoking Firefox. (CVE-2016-1935)

    It was discovered that a delay was missing when focusing the protocol handler dialog. If a user were     tricked in to opening a specially crafted website, an attacker could potentially exploit this to conduct     clickjacking attacks. (CVE-2016-1937)

    Hanno Bck discovered that calculations with mp_div and mp_exptmod in NSS produce incorrect results in     some circumstances, resulting in cryptographic weaknesses. (CVE-2016-1938)

    Nicholas Hurley discovered that Firefox allows for control characters to be set in cookie names. An     attacker could potentially exploit this to conduct cookie injection attacks on some web servers.
    (CVE-2016-1939)

    It was discovered that when certain invalid URLs are pasted in to the addressbar, the addressbar contents     may be manipulated to show the location of arbitrary websites. An attacker could potentially exploit this     to conduct URL spoofing attacks. (CVE-2016-1942)

    Ronald Crane discovered three vulnerabilities through code inspection. If a user were tricked in to     opening a specially crafted website, an attacker could potentially exploit these to cause a denial of     service via application crash, or execute arbitrary code with the privileges of the user invoking Firefox.
    (CVE-2016-1944, CVE-2016-1945, CVE-2016-1946)

    Franois Marier discovered that Application Reputation lookups didn't work correctly, disabling warnings     for potentially malicious downloads. An attacker could potentially exploit this by tricking a user in to     downloading a malicious file. Other parts of the Safe Browsing feature were unaffected by this.
    (CVE-2016-1947)

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

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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Ubuntu 14.04 LTS : Firefox vulnerabilities (USN-2880-1)

critical Nessus Plugin ID 88456

Version 1.20