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CVE-2004-0902: Multiple heap-based buffer overflows in Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and

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HIGH 10.0WATCHLISTDOWNGRADEDOWNGRADEMITIGATE

CVE-2004-0902 is a high-severity flaw (CVSS 10.0) affecting mozilla, thunderbird, linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple heap-based buffer overflows in Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 allow remote attackers to cause a denial of service (application crash) or execute arbitrary code via (1) the "Send page" functionality, (2) certain responses from a malicious POP3 server, or (3) a link containing a non-ASCII hostname.

Why this priority

  • Critical severity
  • EPSS top 4%: very likely to be exploited
  • On your watchlist

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

Risk facts

CVSS score10.0 (High)
EPSS exploit chance10.1% (top 4%)
CISA exploited listNo
Published2005-01-27
Last modified2026-06-16
Publisher (CNA): MITRE · Vendor: conectiva · mozilla · redhat

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

mozilla mozilla DOWNGRADE
Affected: 1.7 · 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: 0.7 · 0.7.1 · 0.7.2 · 0.7.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 0.7
1. Check installed version
apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version
2. No fixed release: DOWNGRADE to a release before 0.7 (Debian / Ubuntu)
apt-cache madison thunderbird sudo apt install thunderbird=<VERSION_BEFORE_0.7> sudo apt-mark hold thunderbird
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list thunderbird sudo dnf downgrade thunderbird-<VERSION_BEFORE_0.7> 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.
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.
redhat enterprise linux desktop MITIGATE
Affected: 3.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.0
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 fedora core MITIGATE
Affected: core_1.0
Fixed in: no fixed release known
Safe to downgrade to: a release before core_1.0
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.
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-2004-0902?

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

Is CVE-2004-0902 being exploited?

CVE-2004-0902 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-2004-0902 affect?

CVE-2004-0902 affects mozilla, thunderbird, linux. Severity is high (CVSS 10.0). Multiple heap-based buffer overflows in Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and Thunderbird before 0.8 allow remote attackers to cause a denial of service (application crash) or execute arbitrary code via (1) t

How urgent is CVE-2004-0902?

Priority 64/100. Critical severity; EPSS top 4%: very likely to be exploited; On your watchlist

Software pages

Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

Related CVEs

References

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