Is CVE-2016-2831 in the CISA KEV catalog?

No. CVE-2016-2831 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-2831?

CVE-2016-2831 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2016-2831?

CVE-2016-2831 has an EPSS score of 1.35% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-2831?

Upgrade firefox on debian unstable to 47.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-2831

HIGH

8.8

CVSS v3

NVD

Description

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.

CWE-254 CWE-284Improper Access Control

How to fix

Remediation Available

firefoxDebian

Fixed in:47.0-1CVE-2016-2831

firefoxUbuntu

Fixed in:47.0+build3-0ubuntu0.14.04.1USN-2993-1

Fixed in:47.0+build3-0ubuntu0.16.04.1USN-2993-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:H

Exploit Intelligence

1.35%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory7

Issue Tracking1

bugzilla.mozilla.org

Other references2

Related Vulnerabilities

Other CWE-254 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-0161	Medium	6.5	69%	-	-
CVE-2016-2296	Critical	9.4	64%	-	-
CVE-2015-1793	Medium	6.5	62%	-	Fix
CVE-2016-2118	High	7.5	37%	-	Fix
CVE-2016-3238	High	8.1	35%	-	-
CVE-2016-3198	Medium	6.5	32%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.