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Fencer Intel
high 8.6

CVE-2017-5448 json

An out-of-bounds write in "ClearKeyDecryptor" while decrypting some Clearkey-encrypted media content.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14552

cvss
8.6
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

An out-of-bounds write in "ClearKeyDecryptor" while decrypting some Clearkey-encrypted media content. The "ClearKeyDecryptor" code runs within the Gecko Media Plugin (GMP) sandbox. If a second mechanism is found to escape the sandbox, this vulnerability allows for the writing of arbitrary data within memory, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Patch / fix

  • Mozilla Firefox ESR 45.9, 52.1
  • Mozilla Firefox 53
  • firefox-esr Debian 14, Debian 13, Debian 12 45.9.0esr-1

debian advisories DEBIAN-CVE-2017-5448

  • firefox Ubuntu 14.04 LTS 53.0+build6-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 53.0+build6-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-5448

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 7 52.1.0-2.el7_3
  • firefox RHEL 6 52.1.0-2.el6_9

red hat advisories RHSA-2017:1106RHSA-2017:1104

  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 3.29.5-47.3.2
  • firefox-gcc5 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 5.3.1+r233831-7.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.2.0esr-72.5.2
  • firefox-libffi-gcc5 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 5.3.1+r233831-7.1
  • MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 52-24.3.44
  • MozillaFirefox-branding-SLE SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +6 more 52-31.1
  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +7 more 52.2.0esr-108.3
  • 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

suse advisories SUSE-SU-2017:2235-1SUSE-SU-2017:1669-1SUSE-SU-2017:1248-1SUSE-SU-2017:1175-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1

  • firefox Arch Linux 53.0-1

arch linux advisories AVG-249

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-2017-5448 updated cvss 8.6

Mozilla: Out-of-bounds write in ClearKeyDecryptor (MFSA 2017-11, MFSA 2017-12)

  • Red Hat Enterprise Linux 5 firefox
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) firefox 52.1.0-2.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.1.0-2.el7_3
    fixed: vendor fix RHSA-2017:1106
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 52.1.0-2.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.1.0-2.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.1.0-2.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.1.0-2.el6_9
    fixed: vendor fix RHSA-2017:1104
  • Red Hat Enterprise Linux Server (v. 7) firefox 52.1.0-2.el7_3
    fixed: vendor fix RHSA-2017:1106
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.1.0-2.el6_9
    fixed: vendor fix RHSA-2017:1104
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.1.0-2.el7_3
    fixed: vendor fix RHSA-2017:1106
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 52.1.0-2.el6_9
    fixed: vendor fix RHSA-2017:1104
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 52.1.0-2.el7_3
    fixed: vendor fix RHSA-2017:1106
show 3 more
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.1.0-2.el6_9
    fixed: vendor fix RHSA-2017:1104
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.1.0-2.el7_3
    fixed: vendor fix RHSA-2017:1106
  • 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

2.02% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness

References

Sources

Fencer Intel 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.