Is CVE-2016-1951 in the CISA KEV catalog?

No. CVE-2016-1951 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1951?

CVE-2016-1951 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2016-1951?

CVE-2016-1951 has an EPSS score of 2.72% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1951?

Upgrade firefox on debian unstable to 45.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1951

HIGHEPSS 84th pctl

8.6

CVSS v3

NVD

Description

Multiple integer overflows in io/prprf.c in Mozilla Netscape Portable Runtime (NSPR) before 4.12 allow remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact via a long string to a PR_*printf function.

CWE-190Integer Overflow

How to fix

Remediation Available

firefoxDebian

Fixed in:45.0-1CVE-2016-1951

libnspr4Ubuntu

Fixed in:2:4.12-0ubuntu0.14.04.1USN-3028-1

Fixed in:2:4.12-0ubuntu0.16.04.1USN-3028-1

nsprUbuntu

Fixed in:2:4.12-0ubuntu0.14.04.1USN-3028-1

Fixed in:2:4.12-0ubuntu0.16.04.1USN-3028-1

thunderbirdUbuntu

Fixed in:1:45.2.0+build1-0ubuntu0.14.04.3USN-3023-1

Fixed in:1:45.2.0+build1-0ubuntu0.16.04.1USN-3023-1

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

ConfidentialityLow

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

2.72%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Issue Tracking1

bugzilla.mozilla.org

Mailing List1

groups.google.com

Other references4

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	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.