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CVE-2023-32214: Protocol handlers `ms-cxh` and `ms-cxh-full` could have been leveraged to trigger a denial of service. *Note:

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HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2023-32214 is a high-severity flaw (CVSS 7.5) affecting firefox, firefox esr, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Protocol handlers `ms-cxh` and `ms-cxh-full` could have been leveraged to trigger a denial of service. *Note: This attack only affects Windows. Other operating systems are not affected.* This vulnerability affects Firefox < 113, Firefox ESR < 102.11, and Thunderbird < 102.11.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.9% (top 40%)
CISA exploited listNo
Published2023-06-19
Last modified2026-10-23
Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Am I affected?

Timeline

mozilla firefox UPGRADE
Affected: < 113.0
Fixed in: 113.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
2. UPGRADE to 113.0 (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: < 102.11
Fixed in: 102.11
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 102.11 (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: < 102.11
Fixed in: 102.11
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version
2. UPGRADE to 102.11 (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 · rubygem-eventmachine · FIXED · 1.2.7-37.fc46 · FEDORA-2026-7194c202a2 · source
sudo dnf upgrade --advisory=FEDORA-2026-7194c202a2
Debian 12 · firefox-esr · NOT AFFECTED
Debian 13 · firefox-esr · NOT AFFECTED
Debian 12 · thunderbird · NOT AFFECTED
Debian 13 · thunderbird · NOT AFFECTED
RHEL 6 · firefox · NOT AFFECTED
RHEL 6 · thunderbird · NOT AFFECTED
RHEL 7 · firefox · NOT AFFECTED
RHEL 7 · thunderbird · NOT AFFECTED
RHEL 8 · firefox · NOT AFFECTED
Alpine 3.20 · firefox-esr · FIXED · firefox-esr-102.11.0-r0
apk add --upgrade firefox-esr apk info -v firefox-esr
Alpine 3.21 · firefox-esr · FIXED · firefox-esr-102.11.0-r0
apk add --upgrade firefox-esr apk info -v firefox-esr
Alpine 3.22 · firefox-esr · FIXED · firefox-esr-102.11.0-r0
apk add --upgrade firefox-esr apk info -v firefox-esr
Alpine 3.23 · firefox-esr · FIXED · firefox-esr-102.11.0-r0
apk add --upgrade firefox-esr apk info -v firefox-esr
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.

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References

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