Is CVE-2016-1950 in the CISA KEV catalog?

No. CVE-2016-1950 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1950?

CVE-2016-1950 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2016-1950?

CVE-2016-1950 has an EPSS score of 4.19% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1950?

Upgrade firefox on debian unstable to 45.0-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1950

HIGHEPSS 90th pctl

8.8

CVSS v3

NVD

Description

Heap-based buffer overflow in Mozilla Network Security Services (NSS) before 3.19.2.3 and 3.20.x and 3.21.x before 3.21.1, as used in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7, allows remote attackers to execute arbitrary code via crafted ASN.1 data in an X.509 certificate.

CWE-119Buffer Overflow

How to fix

Remediation Available

firefoxDebian

Fixed in:45.0-1CVE-2016-1950

firefoxUbuntu

Fixed in:45.0+build2-0ubuntu0.14.04.1USN-2917-1

libnss3Ubuntu

Fixed in:2:3.21-0ubuntu0.14.04.2USN-2924-1

nssUbuntu

Fixed in:2:3.21-0ubuntu0.14.04.2USN-2924-1

thunderbirdUbuntu

Fixed in:1:38.7.2+build1-0ubuntu0.14.04.1USN-2934-1

Fixed in:1:38.7.2+build1-0ubuntu0.16.04.1USN-2934-1

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

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.19%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory8

Issue Tracking1

bugzilla.mozilla.org

Mailing List4

Release Notes2

Other references21

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.