high 7.5

CVE-2024-4777 json

Memory safety bugs present in Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10.

published 2024-05-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-44370

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits: 0; none known

Memory safety bugs present in Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10. 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 < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

Patch / fix

fixed in 4 distros 7

Mozilla Firefox 126
Mozilla Firefox ESR 115.11
Mozilla Thunderbird 115.11
mozilla firefox_esr 115.11

debian ubuntu red hat suse opensuse almalinux rocky linux

firefox-esr Debian 12 115.11.0esr-1~deb12u1
firefox-esr Debian 14, Debian 13 115.11.0esr-1
thunderbird Debian 12 1:115.11.0-1~deb12u1
thunderbird Debian 14, Debian 13 1:115.11.0-1

debian advisories DEBIAN-CVE-2024-4777

firefox Ubuntu 20.04 LTS 126.0+build2-0ubuntu0.20.04.1
thunderbird Ubuntu 20.04 LTS 1:115.11.0+build2-0ubuntu0.20.04.1
thunderbird Ubuntu 22.04 LTS 1:115.11.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2024-4777

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 8 115.11.0-1.el8_10
firefox RHEL 8 115.11.0-1.el8_10
thunderbird RHEL 9 115.11.0-1.el9_4
firefox RHEL 7 115.11.0-1.el7_9
thunderbird RHEL 7 115.11.0-1.el7_9
firefox RHEL 9 115.11.0-1.el9_4
firefox-x11 RHEL 9 115.11.0-1.el9_4
thunderbird RHEL 9.2 EUS 115.11.0-1.el9_2

red hat advisories RHSA-2024:2903 RHSA-2024:3784 RHSA-2024:2904 RHSA-2024:3783 RHSA-2024:2888 RHSA-2024:3338

MozillaThunderbird SLE Workstation Extension 15 SP6, SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP6 +3 more 115.11.0-150200.8.160.1
MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +12 more 115.11.0-150200.152.137.2
MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.11.0-112.212.1

suse advisories SUSE-SU-2024:1858-1 SUSE-SU-2024:1770-1 SUSE-SU-2024:1676-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 126.0-1.1
MozillaThunderbird openSUSE Tumbleweed 115.11.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:13980-1 openSUSE-SU-2024:13981-1

firefox AlmaLinux 8 115.11.0-1.el8_10.alma.1
thunderbird AlmaLinux 8 115.11.0-1.el8_10.alma.1
firefox AlmaLinux 9 115.11.0-1.el9_4.alma.1
firefox-x11 AlmaLinux 9 115.11.0-1.el9_4.alma.1
thunderbird AlmaLinux 9 115.11.0-1.el9_4.alma.1

almalinux advisories ALSA-2024:3783 ALSA-2024:3784 ALSA-2024:2883 ALSA-2024:2888

thunderbird Rocky Linux 9 115.11.0-1.el9_4
firefox Rocky Linux 8 115.11.0-1.el8_10
thunderbird Rocky Linux 8 115.11.0-1.el8_10

rocky linux advisories RLSA-2024:2888 RLSA-2024:3783 RLSA-2024:3784

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-2024-4777 updated 2026-11-05 cvss 6.1

Mozilla: Memory safety bugs fixed in Firefox 126, Firefox ESR 115.11, and Thunderbird 115.11

Red Hat Enterprise Linux 6 firefox, thunderbird
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) firefox 115.11.0-1.el8_10, thunderbird 115.11.0-1.el8_10
fixed: vendor fix RHSA-2024:3783
Red Hat Enterprise Linux AppStream (v. 9) firefox 115.11.0-1.el9_4, firefox-x11 115.11.0-1.el9_4, thunderbird 115.11.0-1.el9_4
fixed: vendor fix RHSA-2024:2883
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.11.0-1.el8_2, thunderbird 115.11.0-1.el8_2
fixed: vendor fix RHSA-2024:2882
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.11.0-1.el8_4, thunderbird 115.11.0-1.el8_4 Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.11.0-1.el8_4, thunderbird 115.11.0-1.el8_4
fixed: vendor fix RHSA-2024:2886
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 115.11.0-1.el8_6, thunderbird 115.11.0-1.el8_6
fixed: vendor fix RHSA-2024:2887
Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 115.11.0-1.el8_8, thunderbird 115.11.0-1.el8_8
fixed: vendor fix RHSA-2024:2885
Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.11.0-1.el9_0, thunderbird 115.11.0-1.el9_0
fixed: vendor fix RHSA-2024:2884

show 3 more

Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 115.11.0-1.el9_2, firefox-x11 115.11.0-1.el9_2, thunderbird 115.11.0-1.el9_2
fixed: vendor fix RHSA-2024:2906
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.11.0-1.el8_4, thunderbird 115.11.0-1.el8_4
fixed: vendor fix RHSA-2024:2886
Red Hat Enterprise Linux Client (v. 7) firefox 115.11.0-1.el7_9, thunderbird 115.11.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.11.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.11.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.11.0-1.el7_9, thunderbird 115.11.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.11.0-1.el7_9, thunderbird 115.11.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.11.0-1.el7_9
fixed: vendor fix RHSA-2024:2881

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 (2024-05-15)

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% 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:H/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	7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Mozilla Firefox
Mozilla Firefox ESR
Mozilla Thunderbird
mozilla firefox_esr

Classification

Weakness

CWE-416 Use After Free
CWE-787 Out-of-bounds Write

References

mozilla.org /security/advisories/mfsa2024-21/
vendor-advisory
mozilla.org /security/advisories/mfsa2024-22/
vendor-advisory
mozilla.org /security/advisories/mfsa2024-23/
vendor-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1878199%2C1893340
issue-tracking
lists.debian.org /debian-lts-announce/2024/05/msg00010.html
mailing-list
lists.debian.org /debian-lts-announce/2024/05/msg00012.html
mailing-list

Sources

CVE List CVE-2024-4777
NVD CVE-2024-4777

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.

Summary