CVE-2023-29550: Memory safety bugs present in Firefox 111 and Firefox ESR 102.9

Q: How do I fix CVE-2023-29550?

firefox: upgrade to 112.0; firefox esr: upgrade to 102.10; firefox mobile: upgrade to 112.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-29550 being exploited?

CVE-2023-29550 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-29550 affect?

CVE-2023-29550 affects firefox, firefox esr, firefox mobile. Severity is high (CVSS 8.8). Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. 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 vulnerabilit

This month

HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2023-29550 is a high-severity flaw (CVSS 8.8) affecting firefox, firefox esr, firefox mobile. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. 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 < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Published	2023-06-02
Last modified	2026-10-24

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-02 17:15 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 112.0

Fixed in: 112.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox || rpm -q firefox || firefox --version

2. UPGRADE to 112.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mozilla firefox esr UPGRADE

Affected: < 102.10

Fixed in: 102.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox-esr || rpm -q firefox-esr || firefox-esr --version

2. UPGRADE to 102.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox-esr

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox-esr

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mozilla firefox mobile UPGRADE

Affected: < 112.0

Fixed in: 112.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox-mobile || rpm -q firefox-mobile || firefox-mobile --version

2. UPGRADE to 112.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox-mobile

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox-mobile

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mozilla focus UPGRADE

Affected: < 112.0

Fixed in: 112.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy focus || rpm -q focus || focus --version

2. UPGRADE to 112.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade focus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade focus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mozilla thunderbird UPGRADE

Affected: < 102.10

Fixed in: 102.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version

2. UPGRADE to 102.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade thunderbird

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade thunderbird

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Ubuntu 22.04 · firefox · NOT AFFECTED

Ubuntu 20.04 · firefox · FIXED · 112.0+build2-0ubuntu0.20.04.1

sudo apt update && sudo apt install --only-upgrade firefox dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox)" ge "112.0+build2-0ubuntu0.20.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · firefox · NOT AFFECTED

Ubuntu 22.04 · mozjs102 · FIXED · 102.11.0-0ubuntu0.22.04.1

sudo apt update && sudo apt install --only-upgrade mozjs102 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' mozjs102)" ge "102.11.0-0ubuntu0.22.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · mozjs102 · NOT AFFECTED

Debian 12 · firefox-esr · FIXED · 102.10.0esr-1

sudo apt update && sudo apt install --only-upgrade firefox-esr dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "102.10.0esr-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · firefox-esr · FIXED · 102.10.0esr-1

sudo apt update && sudo apt install --only-upgrade firefox-esr dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "102.10.0esr-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · thunderbird · FIXED · 1:102.10.0-1

sudo apt update && sudo apt install --only-upgrade thunderbird dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:102.10.0-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · thunderbird · FIXED · 1:102.10.0-1

sudo apt update && sudo apt install --only-upgrade thunderbird dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:102.10.0-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 7 · firefox · FIXED · firefox-102.10.0-1.el7_9

sudo dnf upgrade --advisory=RHSA-2023:1791 rpm -q firefox

RHEL 7 · thunderbird · FIXED · thunderbird-102.10.0-2.el7_9

sudo dnf upgrade --advisory=RHSA-2023:1806 rpm -q thunderbird

RHEL 8 · firefox · FIXED · firefox-102.10.0-1.el8_7

sudo dnf upgrade --advisory=RHSA-2023:1787 rpm -q firefox

RHEL 8 · thunderbird · FIXED · thunderbird-102.10.0-2.el8_7

sudo dnf upgrade --advisory=RHSA-2023:1802 rpm -q thunderbird

RHEL 8.1 Update Services for SAP Solutions · firefox · FIXED · firefox-102.10.0-1.el8_1

sudo dnf upgrade --advisory=RHSA-2023:1792 rpm -q firefox

Alpine 3.20 · firefox-esr · FIXED · firefox-esr-102.10.0-r0

apk add --upgrade firefox-esr apk info -v firefox-esr

Alpine 3.21 · firefox-esr · FIXED · firefox-esr-102.10.0-r0

apk add --upgrade firefox-esr apk info -v firefox-esr

Alpine 3.22 · firefox-esr · FIXED · firefox-esr-102.10.0-r0

apk add --upgrade firefox-esr apk info -v firefox-esr

Alpine 3.23 · firefox-esr · FIXED · firefox-esr-102.10.0-r0

apk add --upgrade firefox-esr apk info -v firefox-esr

Amazon Linux 2 · see advisory · FIXED · ALAS2-2023-2028 · source

sudo yum update --advisory=ALAS2-2023-2028

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-29550?

firefox: upgrade to 112.0; firefox esr: upgrade to 102.10; firefox mobile: upgrade to 112.0. Exact commands for each OS are on this page.

Is CVE-2023-29550 being exploited?

CVE-2023-29550 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-29550 affect?

CVE-2023-29550 affects firefox, firefox esr, firefox mobile. Severity is high (CVSS 8.8). Memory safety bugs present in Firefox 111 and Firefox ESR 102.9. 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 vulnerabilit

How urgent is CVE-2023-29550?

Priority 44/100. High severity

Software pages

Android vulnerabilities · Mozilla Firefox vulnerabilities

Related CVEs

CVE-2023-29531 CRITICAL 9.8 UPGRADE UPGRADE An attacker could have caused an out of bounds memory access using WebGL APIs, leading to memory corruption an
CVE-2023-34416 CRITICAL 9.8 UPGRADE UPGRADE Memory safety bugs present in Firefox 113, Firefox ESR 102.11, and Thunderbird 102.12
CVE-2026-5731 CRITICAL 9.8 DOWNGRADE DOWNGRADE Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.
CVE-2023-37202 HIGH 8.8 UPGRADE UPGRADE Cross-compartment wrappers wrapping a scripted proxy could have caused objects from other compartments to be s
CVE-2023-37211 HIGH 8.8 UPGRADE UPGRADE Memory safety bugs present in Firefox 114, Firefox ESR 102.12, and Thunderbird 102.12

References

← Back to latest CVEs