Is CVE-2016-5254 in the CISA KEV catalog?

No. CVE-2016-5254 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5254?

CVE-2016-5254 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-5254?

CVE-2016-5254 has an EPSS score of 2.95% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5254?

Upgrade firefox on debian unstable to 48.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-5254

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

Description

Use-after-free vulnerability in the nsXULPopupManager::KeyDown function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows attackers to execute arbitrary code or cause a denial of service (heap memory corruption and application crash) by leveraging keyboard access to use the Alt key during selection of top-level menu items.

CWE-416Use After Free

How to fix

Remediation Available

firefoxDebian

Fixed in:48.0-1CVE-2016-5254

firefoxUbuntu

Fixed in:48.0+build2-0ubuntu0.14.04.1USN-3044-1

Fixed in:48.0+build2-0ubuntu0.16.04.1USN-3044-1

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.95%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory1

oracle.com

Issue Tracking1

bugzilla.mozilla.org

Other references8

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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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.