CVE-2023-29545: Similar to CVE-2023-28163, this time when choosing 'Save Link As', suggested filenames containing environment

Q: How do I fix CVE-2023-29545?

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

Q: Is CVE-2023-29545 being exploited?

CVE-2023-29545 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-2023-29545 affect?

CVE-2023-29545 affects firefox, firefox esr, thunderbird. Severity is medium (CVSS 6.5). Similar to CVE-2023-28163, this time when choosing 'Save Link As', suggested filenames containing environment variable names would have resolved those in the context of the current user. *This bug only affects Firefox and Thunderbird on W

Q: How urgent is CVE-2023-29545?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADEUPGRADEUPGRADE

CVE-2023-29545 is a medium-severity flaw (CVSS 6.5) affecting firefox, firefox esr, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Similar to CVE-2023-28163, this time when choosing 'Save Link As', suggested filenames containing environment variable names would have resolved those in the context of the current user. *This bug only affects Firefox and Thunderbird on Windows. Other versions of Firefox and Thunderbird are unaffected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 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 53%)
CISA exploited list	No
Published	2023-06-19
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

2023-06-19 11:15 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 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 22.04 · firefox · NOT AFFECTED

Ubuntu 24.04 · firefox · NOT AFFECTED

Ubuntu 22.04 · thunderbird · NOT AFFECTED

Ubuntu 24.04 · thunderbird · NOT AFFECTED

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-102.10.0-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

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-2023-29545?

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

Is CVE-2023-29545 being exploited?

CVE-2023-29545 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-2023-29545 affect?

CVE-2023-29545 affects firefox, firefox esr, thunderbird. Severity is medium (CVSS 6.5). Similar to CVE-2023-28163, this time when choosing 'Save Link As', suggested filenames containing environment variable names would have resolved those in the context of the current user. *This bug only affects Firefox and Thunderbird on W

How urgent is CVE-2023-29545?

Priority 35/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities · Mozilla Firefox vulnerabilities

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References

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