CVE-2023-1945: Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially expl

Q: How do I fix CVE-2023-1945?

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

Q: Is CVE-2023-1945 being exploited?

CVE-2023-1945 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-2023-1945 affect?

CVE-2023-1945 affects firefox esr, thunderbird. Severity is medium (CVSS 6.5). Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 102.10 and Firefox ESR < 102.10.

Q: How urgent is CVE-2023-1945?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADEUPGRADE

CVE-2023-1945 is a medium-severity flaw (CVSS 6.5) affecting firefox esr, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 102.10 and Firefox ESR < 102.10.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-787
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 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 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 ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

Ubuntu 20.04 · thunderbird · FIXED · 1:102.10.0+build2-0ubuntu0.20.04.1

sudo apt update && sudo apt install --only-upgrade thunderbird dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:102.10.0+build2-0ubuntu0.20.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · thunderbird · FIXED · 1:102.10.0+build2-0ubuntu0.22.04.1

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-2023-1945?

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

Is CVE-2023-1945 being exploited?

CVE-2023-1945 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-2023-1945 affect?

CVE-2023-1945 affects firefox esr, thunderbird. Severity is medium (CVSS 6.5). Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 102.10 and Firefox ESR < 102.10.

How urgent is CVE-2023-1945?

Priority 35/100. No elevated risk signals yet.

Software pages

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-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
CVE-2023-25734 HIGH 8.1 UPGRADE UPGRADE After downloading a Windows <code>.url</code> shortcut from the local filesystem, an attacker could supply a r

References

← Back to latest CVEs