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Fencer Vulns
high 8.8

CVE-2016-1950 json

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 Mozil…

published 2016-03-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3039

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • nss Debian 14, Debian 13, Debian 12 2:3.23-1
  • firefox-esr Debian 14, Debian 13, Debian 12 45.0esr-1

debian advisories DEBIAN-CVE-2016-1950

  • nss Ubuntu 14.04 LTS 2:3.21-0ubuntu0.14.04.2
  • nss Ubuntu 16.04 LTS 2:3.21-1ubuntu4
  • firefox Ubuntu 14.04 LTS 45.0+build2-0ubuntu0.14.04.1
  • thunderbird Ubuntu 14.04 LTS 1:38.7.2+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:38.7.2+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-1950

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nss RHEL 5 3.19.1-4.el5_11
  • nss-tools RHEL 5 3.19.1-4.el5_11
  • nss-util RHEL 6 3.19.1-5.el6_7
  • nss-util RHEL 7 3.19.1-9.el7_2
  • nss-util RHEL 6.6 EUS 3.19.1-3.el6_6
  • nss-util RHEL 6.2 MISSION_CRITICAL 3.13.1-10.el6_2
  • nss-util RHEL 6.4 AUS 3.14.3-8.el6_4
  • nss-util RHEL 6.5 AUS 3.16.1-4.el6_5

red hat advisories RHSA-2016:0371RHSA-2016:0370RHSA-2016:0495

  • java-1_8_0-openjdk SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +4 more 1.8.0.121-23.4
  • mozilla-nss SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 3.29.5-57.1
  • mozilla-nspr SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 4.13.1-18.1
  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 45.9.0esr-105.1
  • mozilla-nspr SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 4.13.1-32.1
  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 3.29.5-46.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 45.9.0esr-71.2
  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 3.20.2-28.1

suse advisories SUSE-SU-2017:1248-1SUSE-SU-2017:1175-1SUSE-SU-2016:0909-1SUSE-SU-2016:0777-1SUSE-SU-2016:0727-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1
  • mozilla-nss openSUSE Tumbleweed 3.26.2-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1openSUSE-SU-2024:10451-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-1950 updated cvss 6.8

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

  • Red Hat Enterprise Linux (v. 5 server) nss 3.19.1-4.el5_11, nss-tools 3.19.1-4.el5_11
    fixed: vendor fix RHSA-2016:0371
  • Red Hat Enterprise Linux Client (v. 7) nss-util 3.19.1-9.el7_2 Red Hat Enterprise Linux Client Optional (v. 7) nss-util 3.19.1-9.el7_2 Red Hat Enterprise Linux ComputeNode (v. 7) nss-util 3.19.1-9.el7_2
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) nss-util 3.19.1-5.el7_1
    fixed: vendor fix RHSA-2016:0495
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-util 3.19.1-9.el7_2
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) nss-util 3.19.1-5.el7_1
    fixed: vendor fix RHSA-2016:0495
  • Red Hat Enterprise Linux Desktop (v. 5 client) nss 3.19.1-4.el5_11, nss-tools 3.19.1-4.el5_11
    fixed: vendor fix RHSA-2016:0371
  • Red Hat Enterprise Linux Desktop (v. 6) nss-util 3.19.1-5.el6_7 Red Hat Enterprise Linux Desktop Optional (v. 6) nss-util 3.19.1-5.el6_7
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nss 3.19.1-4.el5_11, nss-tools 3.19.1-4.el5_11
    fixed: vendor fix RHSA-2016:0371
show 7 more
  • Red Hat Enterprise Linux HPC Node (v. 6) nss-util 3.19.1-5.el6_7
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux HPC Node EUS (v. 6.6) nss-util 3.19.1-3.el6_6
    fixed: vendor fix RHSA-2016:0495
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-util 3.19.1-5.el6_7
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.6) nss-util 3.19.1-3.el6_6
    fixed: vendor fix RHSA-2016:0495
  • Red Hat Enterprise Linux Server (v. 6) nss-util 3.19.1-5.el6_7 Red Hat Enterprise Linux Server (v. 7) nss-util 3.19.1-9.el7_2
    fixed: vendor fix RHSA-2016:0370
  • Red Hat Enterprise Linux Server AUS (v. 6.2) nss-util 3.13.1-10.el6_2 Red Hat Enterprise Linux Server AUS (v. 6.4) nss-util 3.14.3-8.el6_4 Red Hat Enterprise Linux Server AUS (v. 6.5) nss-util 3.16.1-4.el6_5 Red Hat Enterprise Linux Server EUS (v. 6.6) nss-util 3.19.1-3.el6_6 Red Hat Enterprise Linux Server EUS (v. 7.1) nss-util 3.19.1-5.el7_1, nss-util 3.19.1-5.ael7b_1
    fixed: vendor fix RHSA-2016:0495
  • Red Hat Enterprise Linux Workstation (v. 6) nss-util 3.19.1-5.el6_7 Red Hat Enterprise Linux Workstation (v. 7) nss-util 3.19.1-9.el7_2
    fixed: vendor fix RHSA-2016:0370

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.19% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.