PatchTheCVECVE-2023-0767: An attacker could construct a PKCS 12 cert bundle in such a way that could allow for arbitrary memory writes v
45
This month
HIGH 8.8UPGRADEUPGRADEUPGRADE
CVE-2023-0767 is a high-severity flaw (CVSS 8.8) affecting firefox, firefox esr, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An attacker could construct a PKCS 12 cert bundle in such a way that could allow for arbitrary memory writes via PKCS 12 Safe Bag attributes being mishandled. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
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 | 0.8% (top 43%) |
| 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
- Published CVE record published
- Updated Record last modified
mozilla firefox UPGRADE
Affected: < 110.0
Fixed in: 110.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
2. UPGRADE to 110.0 (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: < 102.8
Fixed in: 102.8
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 102.8 (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 thunderbird UPGRADE
Affected: < 102.8
Fixed in: 102.8
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version
2. UPGRADE to 102.8 (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 20.04 · firefox · FIXED · 110.0+build3-0ubuntu0.20.04.1
sudo apt update && sudo apt install --only-upgrade firefox
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox)" ge "110.0+build3-0ubuntu0.20.04.1" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · firefox · NOT AFFECTED
Ubuntu 24.04 · firefox · NOT AFFECTED
Ubuntu 20.04 · nss · FIXED · 2:3.49.1-1ubuntu1.9
sudo apt update && sudo apt install --only-upgrade nss
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nss)" ge "2:3.49.1-1ubuntu1.9" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · nss · FIXED · 2:3.68.2-0ubuntu1.2
sudo apt update && sudo apt install --only-upgrade nss
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nss)" ge "2:3.68.2-0ubuntu1.2" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · firefox-esr · FIXED · 102.8.0esr-1
sudo apt update && sudo apt install --only-upgrade firefox-esr
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "102.8.0esr-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · firefox-esr · FIXED · 102.8.0esr-1
sudo apt update && sudo apt install --only-upgrade firefox-esr
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' firefox-esr)" ge "102.8.0esr-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · nss · FIXED · 2:3.87.1-1
sudo apt update && sudo apt install --only-upgrade nss
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nss)" ge "2:3.87.1-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · nss · FIXED · 2:3.87.1-1
sudo apt update && sudo apt install --only-upgrade nss
dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nss)" ge "2:3.87.1-1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 6 Extended Lifecycle Support · nss · FIXED · nss-3.44.0-13.el6_10
sudo dnf upgrade --advisory=RHSA-2023:1366
rpm -q nss
RHEL 7 · nss · FIXED · nss-3.79.0-5.el7_9
sudo dnf upgrade --advisory=RHSA-2023:1332
rpm -q nss
RHEL 8 · nss · FIXED · nss-3.79.0-11.el8_7
sudo dnf upgrade --advisory=RHSA-2023:1252
rpm -q nss
RHEL 8.1 Update Services for SAP Solutions · nss · FIXED · nss-3.44.0-11.el8_1
sudo dnf upgrade --advisory=RHSA-2023:1436
rpm -q nss
RHEL 8.1 Update Services for SAP Solutions · thunderbird · FIXED · thunderbird-102.9.0-2.el8_1
sudo dnf upgrade --advisory=RHSA-2023:1442
rpm -q thunderbird
Alpine 3.20 · firefox-esr · FIXED · firefox-esr-102.8.0-r0
apk add --upgrade firefox-esr
apk info -v firefox-esr
Alpine 3.21 · firefox-esr · FIXED · firefox-esr-102.8.0-r0
apk add --upgrade firefox-esr
apk info -v firefox-esr
Alpine 3.22 · firefox-esr · FIXED · firefox-esr-102.8.0-r0
apk add --upgrade firefox-esr
apk info -v firefox-esr
Alpine 3.23 · firefox-esr · FIXED · firefox-esr-102.8.0-r0
apk add --upgrade firefox-esr
apk info -v firefox-esr
sudo dnf update --advisory=ALAS2023-2023-124
sudo yum update --advisory=ALAS2-2023-1992
sudo yum update --advisory=ALAS-2023-1736
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.
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-2023-0767?
firefox: upgrade to 110.0; firefox esr: upgrade to 102.8; thunderbird: upgrade to 102.8. Exact commands for each OS are on this page.
Is CVE-2023-0767 being exploited?
CVE-2023-0767 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-2023-0767 affect?
CVE-2023-0767 affects firefox, firefox esr, thunderbird. Severity is high (CVSS 8.8). An attacker could construct a PKCS 12 cert bundle in such a way that could allow for arbitrary memory writes via PKCS 12 Safe Bag attributes being mishandled. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR <
How urgent is CVE-2023-0767?
Priority 45/100. High severity
Software pages
Mozilla Firefox vulnerabilities
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