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Fencer Intel
critical 9.8

CVE-2018-5156 json

A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring.

published 2018-10-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16942

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring. This can result in stream data being cast to the wrong type causing a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Patch / fix

  • Mozilla Thunderbird 60
  • Mozilla Firefox ESR 52.9, 60.1
  • Mozilla Firefox 61
  • firefox-esr Debian 14, Debian 13, Debian 12 52.9.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.0-1

debian advisories DEBIAN-CVE-2018-5156

  • firefox Ubuntu 14.04 LTS 61.0+build3-0ubuntu0.14.04.2
  • firefox Ubuntu 16.04 LTS 61.0+build3-0ubuntu0.16.04.2
  • firefox Ubuntu 18.04 LTS 61.0+build3-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-5156

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 6 60.1.0-5.el6
  • firefox RHEL 7 60.1.0-4.el7_5

red hat advisories RHSA-2018:2112RHSA-2018:2113

  • MozillaThunderbird SLE Workstation Extension 15 60.2.1-3.13.1
  • MozillaFirefox SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +9 more 52.9.0esr-109.38.2
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.9.0esr-72.38.6
  • MozillaFirefox SLE Module for Desktop Applications 15 52.9.0esr-3.7.12

suse advisories SUSE-SU-2018:3247-1SUSE-SU-2018:2322-2SUSE-SU-2018:2325-1SUSE-SU-2018:2322-1SUSE-SU-2018:2298-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 60.3.0-74.2
  • seamonkey Package Hub 15 2.49.4-bp150.3.3.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2018:3687-1openSUSE-SU-2018:2807-1

  • thunderbird Arch Linux 60.0-1

arch linux advisories AVG-751

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-2018-5156 updated cvss 9.8

Mozilla: Media recorder segmentation fault when track type is changed during capture

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.1.0-4.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • 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

3.75% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-20 Improper Input Validation

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.