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Fencer Vulns
high 8.8

CVE-2022-38478 json

Members the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 103, Firefox ESR 102.1, and Firefox ESR 91.12.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-41061

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

Members the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 103, Firefox ESR 102.1, and Firefox ESR 91.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 102.2, Thunderbird < 91.13, Firefox ESR < 91.13, Firefox ESR < 102.2, and Firefox < 104.

Patch / fix

  • Mozilla Thunderbird 91.13, 102.2
  • Mozilla Firefox ESR 91.13, 102.2
  • Mozilla Firefox 104
  • firefox-esr Debian 14, Debian 13, Debian 12 102.2.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.2.0-1

debian advisories DEBIAN-CVE-2022-38478

  • firefox Ubuntu 18.04 LTS 104.0+build3-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 104.0+build3-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:102.2.2+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.2.2+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.2.2+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-38478

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 9 91.13.0-1.el9_0
  • thunderbird RHEL 8 91.13.0-1.el8_6
  • thunderbird RHEL 7 91.13.0-1.el7_9
  • firefox RHEL 8 91.13.0-1.el8_6
  • firefox RHEL 9 91.13.0-1.el9_0
  • firefox RHEL 7 91.13.0-1.el7_9
  • thunderbird RHEL 8.4 EUS 91.13.0-1.el8_4
  • firefox RHEL 8.4 EUS 91.13.0-1.el8_4

red hat advisories RHSA-2022:6166RHSA-2022:6165RHSA-2022:6176RHSA-2022:6164RHSA-2022:6169RHSA-2022:6175

  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102.3.0-150200.152.61.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102-150200.9.10.1
  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 102.2.2-150200.8.82.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 102.2.0-112.130.1
  • MozillaFirefox-branding-SLE SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 102-35.9.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 102.2.0-150000.150.56.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 102-150000.4.22.1
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 91.13.0-150200.152.56.2

suse advisories SUSE-SU-2022:3396-1SUSE-SU-2022:3281-1SUSE-SU-2022:3273-1SUSE-SU-2022:3272-1SUSE-SU-2022:3030-1SUSE-SU-2022:3007-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 104.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 102.2.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12286-1openSUSE-SU-2024:12287-1

  • thunderbird AlmaLinux 8 91.13.0-1.el8_6.alma
  • thunderbird AlmaLinux 9 91.13.0-1.el9_0.alma
  • firefox AlmaLinux 9 91.13.0-1.el9_0.alma
  • firefox AlmaLinux 8 91.13.0-1.el8_6.alma

almalinux advisories ALSA-2022:6164ALSA-2022:6165ALSA-2022:6174ALSA-2022:6175

  • firefox Rocky Linux 8 91.13.0-1.el8_6
  • thunderbird Rocky Linux 8 91.13.0-1.el8_6

rocky linux advisories RLSA-2022:6175RLSA-2022:6164

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.2.0-r0

alpine advisories ALPINE-CVE-2022-38478

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

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-2022-38478 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox 104, Firefox ESR 102.2, and Firefox ESR 91.13

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.13.0-1.el8_6, thunderbird 91.13.0-1.el8_6
    fixed: vendor fix RHSA-2022:6175
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 91.13.0-1.el9_0, thunderbird 91.13.0-1.el9_0
    fixed: vendor fix RHSA-2022:6174
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.13.0-1.el8_1, thunderbird 91.13.0-1.el8_1
    fixed: vendor fix RHSA-2022:6178
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.13.0-1.el8_2, thunderbird 91.13.0-1.el8_2
    fixed: vendor fix RHSA-2022:6177
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.13.0-1.el8_4, thunderbird 91.13.0-1.el8_4
    fixed: vendor fix RHSA-2022:6176
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.13.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.13.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.13.0-1.el7_9
    fixed: vendor fix RHSA-2022:6179

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness

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.