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Fencer Vulns
high 7.5

CVE-2024-8383 json

Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does n…

published 2024-09-03 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-49139

cvss
7.5
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 50%
public exploits
0
none known

Summary

Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems don't have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Firefox ESR < 115.15.

Patch / fix

  • Mozilla Firefox 130
  • Mozilla Firefox ESR 115.15, 128.2
  • mozilla firefox_esr 115.15, 128.2
  • firefox-esr Debian 12 115.15.0esr-1~deb12u1
  • firefox-esr Debian 14, Debian 13 115.15.0esr-1
  • thunderbird Debian 12 1:115.15.0-1~deb12u1

debian advisories DEBIAN-CVE-2024-8383

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

ubuntu advisories UBUNTU-CVE-2024-8383

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 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
  • firefox RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 128.2.0-1.el8_6
  • firefox RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 128.2.0-1.el8_4
  • firefox RHEL 7 ELS 128.2.0-1.el7_9

red hat advisories RHSA-2024:6892RHSA-2024:6891RHSA-2024:6682RHSA-2024:6838RHSA-2024:6681

  • 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-2024:3157-1SUSE-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

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

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

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

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-2024-8383 updated cvss 7.5

mozilla: Firefox did not ask before openings news: links in an external application

  • Red Hat Enterprise Linux 6 firefox
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 firefox, firefox-x11
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 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
    fixed: vendor fix RHSA-2024:6681
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 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
    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
    fixed: vendor fix RHSA-2024:6891
show 7 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 128.2.0-1.el8_6
    fixed: vendor fix RHSA-2024:6892
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 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
    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
    fixed: vendor fix RHSA-2024:6786
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 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
    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
partial
Assessed
2 y ago

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • mozilla firefox_esr

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default

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.