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Fencer Vulns
high 8.8

CVE-2016-2831 json

Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 do not ensure that the user approves the fullscreen and pointerlock settings,…

published 2016-06-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3904

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 do not ensure that the user approves the fullscreen and pointerlock settings, which allows remote attackers to cause a denial of service (UI outage), or conduct clickjacking or spoofing attacks, via a crafted web site.

Patch / fix

  • firefox-esr Debian 14, Debian 13, Debian 12 45.2.0esr-1

debian advisories DEBIAN-CVE-2016-2831

  • firefox Ubuntu 14.04 LTS 47.0+build3-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 47.0+build3-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-2831

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox RHEL 5 45.2.0-1.el5_11
  • firefox RHEL 6 45.2.0-1.el6_8
  • firefox RHEL 7 45.2.0-1.el7_2

red hat advisories RHSA-2016:1217

  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 3.21.1-35.1
  • mozilla-nspr SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 4.12-29.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 45.2.0esr-45.2
  • firefox-fontconfig SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 2.11.0-2.1
  • MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +5 more 45.0-23.10
  • mozilla-nss SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 3.21.1-46.2
  • mozilla-nspr SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 4.12-15.2
  • MozillaFirefox SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 45.2.0esr-75.2

suse advisories SUSE-SU-2016:2061-1SUSE-SU-2016:1799-1SUSE-SU-2016:1691-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-2831 updated cvss 4.3

Mozilla: Entering fullscreen and persistent pointerlock without user permission (MFSA 2016-58)

  • Red Hat Enterprise Linux (v. 5 server) firefox 45.2.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 45.2.0-1.el7_2 Red Hat Enterprise Linux Client Optional (v. 7) firefox 45.2.0-1.el7_2 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 45.2.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 45.2.0-1.el6_8
    +9 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Server (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Server (v. 7) firefox 45.2.0-1.el7_2 Red Hat Enterprise Linux Server Optional (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Server Optional (v. 7) firefox 45.2.0-1.el7_2 Red Hat Enterprise Linux Workstation (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Workstation (v. 7) firefox 45.2.0-1.el7_2 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 45.2.0-1.el6_8 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 45.2.0-1.el7_2
    fixed: vendor fix RHSA-2016:1217
  • Red Hat Enterprise Linux 5 thunderbird Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:H
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:N/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.