CVE-2004-1029: The Sun Java Plugin capability in Java 2 Runtime Environment (JRE) 1.4.2_01, 1.4.2_04, and possibly earlier ve

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HIGH 9.3WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-1029 is a high-severity flaw (CVSS 9.3) affecting java sdk-rte, jdk, jre. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Sun Java Plugin capability in Java 2 Runtime Environment (JRE) 1.4.2_01, 1.4.2_04, and possibly earlier versions, does not properly restrict access between Javascript and Java applets during data transfer, which allows remote attackers to load unsafe classes and execute arbitrary code by using the reflection API to access private Java packages.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
On your watchlist

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	17.0% (top 3%)
CISA exploited list	No
Weakness	CWE-264
Published	2005-03-01
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: conectiva · gentoo · hp · sun · symantec

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

Am I affected?

Timeline

2005-03-01 05:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

hp java sdk-rte DOWNGRADE

Affected: 1.3 · 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy java-sdk-rte || rpm -q java-sdk-rte || java-sdk-rte --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison java-sdk-rte sudo apt install java-sdk-rte=<VERSION_BEFORE_1.3> sudo apt-mark hold java-sdk-rte

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

dnf --showduplicates list java-sdk-rte sudo dnf downgrade java-sdk-rte-<VERSION_BEFORE_1.3> sudo dnf versionlock add java-sdk-rte

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.

sun jdk DOWNGRADE

Affected: 1.3.1_01 · 1.3.1_01a · 1.3.1_02 · 1.3.1_03 · 1.3.1_04 · 1.3.1_05 · 1.3.1_06 · 1.3.1_07

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.1_01

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.1_01 (Debian / Ubuntu)

apt-cache madison jdk sudo apt install jdk=<VERSION_BEFORE_1.3.1_01> sudo apt-mark hold jdk

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

dnf --showduplicates list jdk sudo dnf downgrade jdk-<VERSION_BEFORE_1.3.1_01> sudo dnf versionlock add jdk

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.

sun jre DOWNGRADE

Affected: 1.3.0 · 1.3.0 update1 · 1.3.0 update2 · 1.3.0 update3 · 1.3.0 update4 · 1.3.0 update5 · 1.3.1 · 1.3.1 update1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison jre sudo apt install jre=<VERSION_BEFORE_1.3.0> sudo apt-mark hold jre

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

dnf --showduplicates list jre sudo dnf downgrade jre-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add jre

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.

symantec enterprise firewall DOWNGRADE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

1. Check installed version

apt-cache policy enterprise-firewall || rpm -q enterprise-firewall || enterprise-firewall --version

2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)

apt-cache madison enterprise-firewall sudo apt install enterprise-firewall=<VERSION_BEFORE_8.0> sudo apt-mark hold enterprise-firewall

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

dnf --showduplicates list enterprise-firewall sudo dnf downgrade enterprise-firewall-<VERSION_BEFORE_8.0> sudo dnf versionlock add enterprise-firewall

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: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

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.

gentoo linux MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Sun Java Runtime Environment 1.x Java Plugin - JavaScript Security Restriction Bypass

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-2004-1029?

java sdk-rte: downgrade or apply the listed mitigation; jdk: downgrade or apply the listed mitigation; jre: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-1029 being exploited?

CVE-2004-1029 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-2004-1029 affect?

CVE-2004-1029 affects java sdk-rte, jdk, jre. Severity is high (CVSS 9.3). The Sun Java Plugin capability in Java 2 Runtime Environment (JRE) 1.4.2_01, 1.4.2_04, and possibly earlier versions, does not properly restrict access between Javascript and Java applets during data transfer, which allows remote attackers

How urgent is CVE-2004-1029?

Priority 67/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Java vulnerabilities · Symantec and Broadcom vulnerabilities

References

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