Skip to content
Fencer Vulns
critical 9.8

CVE-2024-8387 json

Memory safety bugs present in Firefox 129, Firefox ESR 128.1, and Thunderbird 128.1.

published 2024-09-03 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-49143

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Memory safety bugs present in Firefox 129, Firefox ESR 128.1, and Thunderbird 128.1. 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 Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.

Patch / fix

  • Mozilla Firefox 130
  • Mozilla Firefox ESR 128.2
  • Mozilla Thunderbird 128.2
  • mozilla firefox_esr 128.2
  • thunderbird Debian 14, Debian 13 1:128.2.0esr-1

debian advisories DEBIAN-CVE-2024-8387

  • firefox Ubuntu 20.04 LTS 130.0+build2-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2024-8387

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 8 128.2.0-1.el8_10
  • thunderbird RHEL 9 128.2.0-1.el9_4
  • firefox RHEL 8 128.2.0-1.el8_10
  • firefox RHEL 9 128.2.0-1.el9_4
  • firefox-x11 RHEL 9 128.2.0-1.el9_4
  • thunderbird RHEL 8.2 AUS 128.2.0-1.el8_2
  • thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 128.2.0-1.el8_4
  • thunderbird RHEL 9.0 E4S 128.2.0-1.el9_0

red hat advisories RHSA-2024:6723RHSA-2024:6721RHSA-2024:6722RHSA-2024:6719RHSA-2024:6892RHSA-2024:6720

  • MozillaThunderbird SLE Workstation Extension 15 SP6, SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP6 +3 more 128.2.3-150200.8.177.1
  • MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +12 more 128.2.0-150200.152.149.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 128.2.0-112.225.1

suse advisories SUSE-SU-2024:3507-1SUSE-SU-2024:3157-1SUSE-SU-2024:3152-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • mozjs128 openSUSE Tumbleweed 128.2.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 130.0.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:14369-1openSUSE-SU-2024:14358-1

  • firefox AlmaLinux 9 128.2.0-1.el9_4.alma.1
  • firefox-x11 AlmaLinux 9 128.2.0-1.el9_4.alma.1
  • firefox AlmaLinux 8 128.2.0-1.el8_10.alma.1
  • thunderbird AlmaLinux 9 128.2.0-1.el9_4.alma.1
  • thunderbird AlmaLinux 8 128.2.0-1.el8_10.alma.1

almalinux advisories ALSA-2024:6681ALSA-2024:6682ALSA-2024:6683ALSA-2024:6684

  • firefox Rocky Linux 9 128.2.0-1.el9_4.0.1
  • thunderbird Rocky Linux 9 128.2.0-1.el9_4.0.1
  • firefox Rocky Linux 8 128.2.0-1.el8_10
  • thunderbird Rocky Linux 8 128.2.0-1.el8_10

rocky linux advisories RLSA-2024:6681RLSA-2024:6683RLSA-2024:6682RLSA-2024:6684

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-2024-8387 updated cvss 9.8

mozilla: Memory safety bugs fixed in Firefox 130, Firefox ESR 128.2, and Thunderbird 128.2

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 128.2.0-1.el8_10, thunderbird 128.2.0-1.el8_10
    fixed: vendor fix RHSA-2024:6682
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 128.2.0-1.el9_4, firefox-x11 128.2.0-1.el9_4, thunderbird 128.2.0-1.el9_4
    fixed: vendor fix RHSA-2024:6681
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 128.2.0-1.el8_2, thunderbird 128.2.0-1.el8_2
    fixed: vendor fix RHSA-2024:6839
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 128.2.0-1.el8_4, thunderbird 128.2.0-1.el8_4
    fixed: vendor fix RHSA-2024:6891
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 128.2.0-1.el8_6
    fixed: vendor fix RHSA-2024:6892
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 128.2.0-1.el8_4, thunderbird 128.2.0-1.el8_4
    fixed: vendor fix RHSA-2024:6891
  • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 128.2.0-1.el8_6
    fixed: vendor fix RHSA-2024:6892
show 6 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 128.2.0-1.el9_0, thunderbird 128.2.0-1.el9_0
    fixed: vendor fix RHSA-2024:6782
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 128.2.0-1.el8_8, thunderbird 128.2.0-1.el8_8
    fixed: vendor fix RHSA-2024:6850
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 128.2.0-1.el9_2, firefox-x11 128.2.0-1.el9_2, thunderbird 128.2.0-1.el9_2
    fixed: vendor fix RHSA-2024:6786
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 128.2.0-1.el8_4, thunderbird 128.2.0-1.el8_4
    fixed: vendor fix RHSA-2024:6891
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 128.2.0-1.el8_6, thunderbird 128.2.0-1.el8_6
    fixed: vendor fix RHSA-2024:6892
  • Red Hat Enterprise Linux Server (v. 7 ELS) firefox 128.2.0-1.el7_9
    fixed: vendor fix RHSA-2024:6838

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
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird
  • mozilla firefox_esr

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.