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Fencer Vulns
critical 9.8

CVE-2016-1962 json

Use-after-free vulnerability in the mozilla::DataChannelConnection::Close function in Mozilla Firefox before 45.0 and Firefox ESR 38.x befo…

published 2016-03-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3051

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Use-after-free vulnerability in the mozilla::DataChannelConnection::Close function in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code by leveraging mishandling of WebRTC data-channel connections.

Patch / fix

  • firefox-esr Debian 14, Debian 13, Debian 12 45.0esr-1

debian advisories DEBIAN-CVE-2016-1962

  • firefox Ubuntu 14.04 LTS 45.0+build2-0ubuntu0.14.04.1

ubuntu advisories UBUNTU-CVE-2016-1962

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

  • firefox RHEL 5 38.7.0-1.el5_11
  • firefox RHEL 6 38.7.0-1.el6_7
  • firefox RHEL 7 38.7.0-1.el7_2

red hat advisories RHSA-2016:0373

  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 3.20.2-28.1
  • mozilla-nspr SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 4.12-24.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 38.7.0esr-37.3
  • mozilla-nss SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 3.20.2-40.1
  • mozilla-nspr SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 4.12-12.1
  • MozillaFirefox SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 38.7.0esr-63.3
  • mozilla-nss SLES 11 SP2-LTSS 3.20.2-20.1
  • mozilla-nspr SLES 11 SP2-LTSS 4.12-19.1

suse advisories SUSE-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

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

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-2016-1962 updated cvss 6.8

Mozilla: Use-after-free when using multiple WebRTC data channels (MFSA 2016-25)

  • Red Hat Enterprise Linux (v. 5 server) firefox 38.7.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 38.7.0-1.el7_2 Red Hat Enterprise Linux Client Optional (v. 7) firefox 38.7.0-1.el7_2 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 38.7.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 38.7.0-1.el6_7
    +9 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Server (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Server (v. 7) firefox 38.7.0-1.el7_2 Red Hat Enterprise Linux Server Optional (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Server Optional (v. 7) firefox 38.7.0-1.el7_2 Red Hat Enterprise Linux Workstation (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Workstation (v. 7) firefox 38.7.0-1.el7_2 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 38.7.0-1.el6_7 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 38.7.0-1.el7_2
    fixed: vendor fix RHSA-2016:0373
  • Red Hat Enterprise Linux 5 thunderbird Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird
    not affected: vulnerable code not present

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

6.08% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

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.