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CVE-2016-1950

30
FAUCET Score

CVE-2016-1950 describes a critical heap-based buffer overflow vulnerability in Mozilla Network Security Services (NSS), impacting various products including Mozilla Firefox, Apple, OpenSUSE, and Oracle. This flaw allows remote attackers to execute arbitrary code by supplying specially crafted ASN.1 data within an X.509 certificate. With a CVSS score of 8.8 (HIGH), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been confirmed, the vulnerability garnered significant community discussion and media coverage at the time of its disclosure.

Impacted Technologies

VendorProductVersion(s)CPE
3.19.2CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.19.2:*:*:*:*:*:*:*
3.20CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.20:*:*:*:*:*:*:*
3.20.1CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.20.1:*:*:*:*:*:*:*
3.21CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:3.21:*:*:*:*:*:*:*
<= 44.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.19%
Probability of exploitation in next 30 days
EPSS Percentile
89.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0419 is in the 90th percentile among its peer group of 14,825 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.1 Extended Update SupportFixed in: nss-util-0:3.19.1-5.el7_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss-0:3.19.1-4.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-util-0:3.19.1-5.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.2 Advanced Update SupportFixed in: nss-util-0:3.13.1-10.el6_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.4 Advanced Update SupportFixed in: nss-util-0:3.14.3-8.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.5 Advanced Update SupportFixed in: nss-util-0:3.16.1-4.el6_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.6 Extended Update SupportFixed in: nss-util-0:3.19.1-3.el6_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-util-0:3.19.1-9.el7_2
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-1950Critical

nss: Heap buffer overflow vulnerability in ASN1 certificate parsing (MFSA 2016-35)

Mar 8, 2016

References

lists.apple.com / archives/security-announce/2016/Mar/msg00000.html
Mailing List
lists.apple.com / archives/security-announce/2016/Mar/msg00001.html
Mailing List
lists.apple.com / archives/security-announce/2016/Mar/msg00002.html
Mailing List
lists.apple.com / archives/security-announce/2016/Mar/msg00004.html
Mailing List
lists.opensuse.org / opensuse-security-announce/2016-03/msg00027.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00029.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00031.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00050.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00068.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00093.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00016.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-0495.html
bto.bluecoat.com / security-advisory/sa119
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.19.2.3_release_notes
Release Notes
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.21.1_release_notes
Release Notes
security.gentoo.org / glsa/201605-06
support.apple.com / HT206166
Third Party Advisory
support.apple.com / HT206167
Third Party Advisory
support.apple.com / HT206168
Third Party Advisory
support.apple.com / HT206169
Third Party Advisory
debian.org / security/2016/dsa-3510
debian.org / security/2016/dsa-3520
debian.org / security/2016/dsa-3688
mozilla.org / security/announce/2016/mfsa2016-35.html
Vendor Advisory
oracle.com / technetwork/security-advisory/cpujul2017-3236622.html
oracle.com / technetwork/security-advisory/cpuoct2016-2881722.html
Third Party Advisory
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
Third Party Advisory
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
Third Party Advisory
securityfocus.com / bid/84223
securitytracker.com / id/1035215
ubuntu.com / usn/USN-2917-1
ubuntu.com / usn/USN-2917-2
ubuntu.com / usn/USN-2917-3
ubuntu.com / usn/USN-2924-1
ubuntu.com / usn/USN-2934-1