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Fencer Vulns
high 7.3

CVE-2024-9403 json

Memory safety bugs present in Firefox 130.

published 2024-10-01 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-49918

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Memory safety bugs present in Firefox 130. 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 < 131 and Thunderbird < 131.

Patch / fix

  • Mozilla Firefox 131
  • Mozilla Thunderbird 131
  • firefox Ubuntu 20.04 LTS 131.0+build1.1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:140.7.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2024-9403

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 8 128.3.0-1.el8_10
  • thunderbird RHEL 9 128.3.0-1.el9_4
  • thunderbird RHEL 8.8 EUS 128.3.1-1.el8_8
  • thunderbird RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 128.3.0-1.el8_6
  • thunderbird RHEL 8.2 AUS 128.3.0-1.el8_2
  • thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 128.3.0-1.el8_4
  • thunderbird RHEL 9.0 E4S 128.3.0-1.el9_0
  • thunderbird RHEL 9.2 EUS 128.3.0-1.el9_2

red hat advisories RHSA-2024:8166RHSA-2024:8169RHSA-2024:7856RHSA-2024:7854RHSA-2024:7855RHSA-2024:7853

  • firefox-esr openSUSE Tumbleweed 153.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 131.0-1.1

opensuse advisories openSUSE-SU-2026:11373-1openSUSE-SU-2024:14385-1

  • thunderbird AlmaLinux 8 128.3.0-1.el8_10.alma.1
  • firefox AlmaLinux 8 128.3.0-1.el8_10.alma.1
  • thunderbird AlmaLinux 9 128.3.0-1.el9_4.alma.1

almalinux advisories ALSA-2024:7699ALSA-2024:7700ALSA-2024:7552

  • thunderbird Rocky Linux 8 128.3.0-1.el8_10

rocky linux advisories RLSA-2024:7699

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-2024-9403 updated cvss 7.5

firefox: thunderbird: Memory safety bugs fixed in Firefox 131 and Thunderbird 131

  • Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 thunderbird-flatpak-container Red Hat Enterprise Linux 10 thunderbird
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 128.3.0-1.el8_10
    fixed: vendor fix RHSA-2024:7699
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 128.3.0-1.el9_4
    fixed: vendor fix RHSA-2024:7552
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 128.3.0-1.el8_2, thunderbird 128.3.0-1.el8_2
    fixed: vendor fix RHSA-2024:7646
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
    fixed: vendor fix RHSA-2024:7703
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
    fixed: vendor fix RHSA-2024:7704
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
    fixed: vendor fix RHSA-2024:7703
show 8 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
    fixed: vendor fix RHSA-2024:7704
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 128.3.0-1.el9_0, thunderbird 128.3.0-1.el9_0
    fixed: vendor fix RHSA-2024:7621
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 128.3.0-1.el8_8, thunderbird 128.3.1-1.el8_8
    fixed: vendor fix RHSA-2024:7842
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 128.3.0-1.el9_2, firefox-x11 128.3.0-1.el9_2, thunderbird 128.3.0-1.el9_2
    fixed: vendor fix RHSA-2024:7622
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 128.3.0-1.el8_4, thunderbird 128.3.0-1.el8_4
    fixed: vendor fix RHSA-2024:7703
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 128.3.0-1.el8_6, thunderbird 128.3.0-1.el8_6
    fixed: vendor fix RHSA-2024:7704
  • Red Hat Enterprise Linux Server (v. 7 ELS) firefox 128.3.0-1.el7_9
    fixed: vendor fix RHSA-2024:7702
  • Red Hat Enterprise Linux 6 firefox Red Hat Enterprise Linux 8 firefox Red Hat Enterprise Linux 9 firefox, firefox-x11 Red Hat Enterprise Linux 10 firefox
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

  • Mozilla Firefox
  • 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.

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