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CVE-2016-1938

18
FAUCET Score

CVE-2016-1938 describes a vulnerability in the s_mp_div function within Mozilla Network Security Services (NSS) versions prior to 3.21, impacting products like Mozilla Firefox. This flaw in number division could potentially weaken cryptographic protection mechanisms when using the mp_div or mp_exptmod functions. Rated as Medium severity with a CVSS score of 6.5, this vulnerability has a network attack vector and low attack complexity, requiring no user interaction. The potential impact includes low confidentiality and integrity loss, with no availability impact. Currently, there is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are minimal, indicating low public attention.

Impacted Technologies

VendorProductVersion(s)CPE
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
<= 3.20.1CPE matchmatch criteria
cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:*
<= 43.0.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.12%
Probability of exploitation in next 30 days
EPSS Percentile
86.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0312 is in the 81st percentile among its peer group of 23,690 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (4)

mozillavendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-softokn
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-softokn

Vendor Advisories (1)

redhatCVE-2016-1938Low

NSS: Errors in mp_div and mp_exptmod cryptographic functions

Jan 26, 2016

References

lists.opensuse.org / opensuse-security-announce/2016-02/msg00001.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-02/msg00002.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-02/msg00010.html
blog.fuzzing-project.org / 37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes
Vendor Advisory
github.com / hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_div.c
github.com / hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_exptmod.c
hg.mozilla.org / projects/nss/diff/a555bf0fc23a/lib/freebl/mpi/mpi.c
security.gentoo.org / glsa/201605-06
security.gentoo.org / glsa/201701-46
debian.org / security/2016/dsa-3688
mozilla.org / security/announce/2016/mfsa2016-07.html
Vendor Advisory
oracle.com / technetwork/security-advisory/cpujul2016-2881720.html
Third Party Advisory
securityfocus.com / bid/81955
securityfocus.com / bid/91787
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034825
ubuntu.com / usn/USN-2880-1
ubuntu.com / usn/USN-2880-2
ubuntu.com / usn/USN-2903-1
ubuntu.com / usn/USN-2903-2
ubuntu.com / usn/USN-2973-1