Is CVE-2016-5281 in the CISA KEV catalog?

No. CVE-2016-5281 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5281?

CVE-2016-5281 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-5281?

CVE-2016-5281 has an EPSS score of 5.04% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5281?

Upgrade firefox on debian unstable to 49.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2016-5281

CRITICALEPSS 91th pctl

9.8

CVSS v3

NVD

Description

Use-after-free vulnerability in the DOMSVGLength class in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to execute arbitrary code by leveraging improper interaction between JavaScript code and an SVG document.

CWE-416Use After Free

How to fix

Remediation Available

firefoxDebian

Fixed in:49.0-1CVE-2016-5281

firefoxUbuntu

Fixed in:49.0+build4-0ubuntu0.14.04.1USN-3076-1

Fixed in:49.0+build4-0ubuntu0.16.04.1USN-3076-1

thunderbirdUbuntu

Fixed in:1:45.4.0+build1-0ubuntu0.14.04.1USN-3112-1

Fixed in:1:45.4.0+build1-0ubuntu0.16.04.1USN-3112-1

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

5.04%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory1

bugzilla.mozilla.org

Other references9

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.