CVE-2004-0904: Integer overflow in the bitmap (BMP) decoder for Mozilla Firefox before the Preview Release, Mozilla before 1.

This week

HIGH 10.0WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-0904 is a high-severity flaw (CVSS 10.0) affecting firefox, mozilla, thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in the bitmap (BMP) decoder for Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 allow remote attackers to execute arbitrary code via wide bitmap files that trigger heap-based buffer overflows.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	8.0% (top 5%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: conectiva · mozilla · netscape · redhat

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

mozilla firefox DOWNGRADE

Affected: 0.8 · 0.9 · 0.9 rc · 0.9.1 · 0.9.2 · 0.9.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.8 (Debian / Ubuntu)

apt-cache madison firefox sudo apt install firefox=<VERSION_BEFORE_0.8> sudo apt-mark hold firefox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list firefox sudo dnf downgrade firefox-<VERSION_BEFORE_0.8> sudo dnf versionlock add firefox

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

mozilla mozilla DOWNGRADE

Affected: 1.7 · 1.7 rc3 · 1.7.1 · 1.7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7 (Debian / Ubuntu)

apt-cache madison mozilla sudo apt install mozilla=<VERSION_BEFORE_1.7> sudo apt-mark hold mozilla

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mozilla sudo dnf downgrade mozilla-<VERSION_BEFORE_1.7> sudo dnf versionlock add mozilla

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

mozilla thunderbird DOWNGRADE

Affected: 0.6 · 0.7 · 0.7.1 · 0.7.2 · 0.7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6 (Debian / Ubuntu)

apt-cache madison thunderbird sudo apt install thunderbird=<VERSION_BEFORE_0.6> sudo apt-mark hold thunderbird

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list thunderbird sudo dnf downgrade thunderbird-<VERSION_BEFORE_0.6> sudo dnf versionlock add thunderbird

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

netscape navigator DOWNGRADE

Affected: 7.0 · 7.0.2 · 7.1 · 7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison navigator sudo apt install navigator=<VERSION_BEFORE_7.0> sudo apt-mark hold navigator

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list navigator sudo dnf downgrade navigator-<VERSION_BEFORE_7.0> sudo dnf versionlock add navigator

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

conectiva linux MITIGATE

Affected: 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux MITIGATE

Affected: 2.1 · 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2004-0904?

firefox: downgrade or apply the listed mitigation; mozilla: downgrade or apply the listed mitigation; thunderbird: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0904 being exploited?

CVE-2004-0904 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-2004-0904 affect?

CVE-2004-0904 affects firefox, mozilla, thunderbird. Severity is high (CVSS 10.0). Integer overflow in the bitmap (BMP) decoder for Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 allow remote attackers to execute arbitrary code via wide bitmap files that trigger heap-based buf

How urgent is CVE-2004-0904?

Priority 64/100. Critical severity; EPSS top 5%: very likely to be exploited; On your watchlist

Software pages

Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

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References

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