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Fencer Vulns
critical 9.8

CVE-2016-9893 json

Memory safety bugs were reported in Thunderbird 45.5.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10682

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Memory safety bugs were reported in Thunderbird 45.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Patch / fix

  • Mozilla Firefox 50.1
  • Mozilla Firefox ESR 45.6
  • Mozilla Thunderbird 45.6
  • firefox-esr Debian 14, Debian 13, Debian 12 45.6.0esr-1

debian advisories DEBIAN-CVE-2016-9893

  • firefox Ubuntu 14.04 LTS 50.1.0+build2-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 50.1.0+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 14.04 LTS 1:45.7.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:45.7.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-9893

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

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 45.6.0-1.el5_11
  • thunderbird RHEL 6 45.6.0-1.el6_8
  • thunderbird RHEL 7 45.6.0-1.el7_3
  • firefox RHEL 5 45.6.0-1.el5_11
  • firefox RHEL 6 45.6.0-1.el6_8
  • firefox RHEL 7 45.6.0-1.el7_3

red hat advisories RHSA-2016:2973RHSA-2016:2946

  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 45.6.0esr-96.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 45.6.0esr-62.1
  • MozillaFirefox SLES 11 SP2-LTSS 45.6.0esr-66.1

suse advisories SUSE-SU-2016:3223-1SUSE-SU-2016:3222-1SUSE-SU-2016:3210-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 45.6.0-20.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10601-1openSUSE-SU-2016:3307-1openSUSE-SU-2016:3308-1

  • firefox-esr Alpine 3.4 45.6.0

alpine advisories ALPINE-CVE-2016-9893

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox Arch Linux 50.1.0-1

arch linux advisories AVG-106

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-2016-9893 updated cvss 9.8

Mozilla: Memory safety bugs fixed in Firefox 50.1 and Firefox ESR 45.6 (MFSA 2016-95)

  • Red Hat Enterprise Linux (v. 5 server) firefox 45.6.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) firefox 45.6.0-1.el7_3 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 45.6.0-1.el5_11, thunderbird 45.6.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 45.6.0-1.el6_8
    +1 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 45.6.0-1.el6_8
    fixed: vendor fix RHSA-2016:2946
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 45.6.0-1.el5_11
    fixed: vendor fix RHSA-2016:2973
  • Red Hat Enterprise Linux Server (v. 6) firefox 45.6.0-1.el6_8 Red Hat Enterprise Linux Server (v. 7) firefox 45.6.0-1.el7_3 Red Hat Enterprise Linux Server Optional (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Server Optional (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Workstation (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3
    +2 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 45.6.0-1.el6_8 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 45.6.0-1.el7_3
    fixed: vendor fix RHSA-2016:2946

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

2.56% chance of exploitation in the next 30 days, higher than 85% 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 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

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.