Is CVE-2016-1938 in the CISA KEV catalog?

No. CVE-2016-1938 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1938?

CVE-2016-1938 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2016-1938?

CVE-2016-1938 has an EPSS score of 3.12% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1938?

Upgrade nss on debian 11 to 2:3.21-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1938

MEDIUMEPSS 86th pctl

6.5

CVSS v3

NVD

Description

The s_mp_div function in lib/freebl/mpi/mpi.c in Mozilla Network Security Services (NSS) before 3.21, as used in Mozilla Firefox before 44.0, improperly divides numbers, which might make it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging use of the (1) mp_div or (2) mp_exptmod function.

CWE-310Cryptographic Issues

How to fix

Remediation Available

nssDebian

Fixed in:2:3.21-1CVE-2016-1938

firefoxUbuntu

Fixed in:44.0+build3-0ubuntu0.14.04.1USN-2880-1

libnss3Ubuntu

Fixed in:2:3.21-0ubuntu0.14.04.1USN-2903-1

nssUbuntu

Fixed in:2:3.21-0ubuntu0.14.04.1USN-2903-1

thunderbirdUbuntu

Fixed in:1:38.8.0+build1-0ubuntu0.14.04.1USN-2973-1

Fixed in:1:38.8.0+build1-0ubuntu0.16.04.1USN-2973-1

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

AvailabilityNone

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

Exploit Intelligence

3.12%probability of exploitation in 30 days

86thpercentile

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

References

Vendor Advisory2

Third-Party Advisory4

Issue Tracking2

Other references15

Related Vulnerabilities

Other CWE-310 (Cryptographic Issues) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3566	Low	3.4	100%	-	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2015-0204	Medium	4.3	99%	-	Fix
CVE-2016-2107	Medium	5.9	89%	-	Fix
CVE-2016-0800	Medium	5.9	82%	-	Fix
CVE-2014-8684	Critical	9.8	72%	-	-

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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.