CVE-2004-0419: XDM in XFree86 opens a chooserFd TCP socket even when DisplayManager.requestPort is 0, which could allow remot

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HIGH 7.5WATCHLISTDOWNGRADEDOWNGRADEMITIGATE

CVE-2004-0419 is a high-severity flaw (CVSS 7.5) affecting x11r6, xdm, linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XDM in XFree86 opens a chooserFd TCP socket even when DisplayManager.requestPort is 0, which could allow remote attackers to connect to the port, in violation of the intended restrictions.

Why this priority

High severity
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Published	2004-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: gentoo · x.org · xfree86 project

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

Am I affected?

Timeline

2004-08-18 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

x.org x11r6 DOWNGRADE

Affected: 6.7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.7.0

1. Check installed version

apt-cache policy x11r6 || rpm -q x11r6 || x11r6 --version

2. No fixed release: DOWNGRADE to a release before 6.7.0 (Debian / Ubuntu)

apt-cache madison x11r6 sudo apt install x11r6=<VERSION_BEFORE_6.7.0> sudo apt-mark hold x11r6

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

dnf --showduplicates list x11r6 sudo dnf downgrade x11r6-<VERSION_BEFORE_6.7.0> sudo dnf versionlock add x11r6

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.

xfree86 project xdm DOWNGRADE

Affected: cvs

Fixed in: no fixed release known

Safe to downgrade to: a release before cvs

1. Check installed version

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

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

apt-cache madison xdm sudo apt install xdm=<VERSION_BEFORE_cvs> sudo apt-mark hold xdm

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

dnf --showduplicates list xdm sudo dnf downgrade xdm-<VERSION_BEFORE_cvs> sudo dnf versionlock add xdm

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.

gentoo linux MITIGATE

Affected: 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

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-2004-0419?

x11r6: downgrade or apply the listed mitigation; xdm: downgrade or apply the listed mitigation; linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0419 being exploited?

CVE-2004-0419 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-2004-0419 affect?

CVE-2004-0419 affects x11r6, xdm, linux. Severity is high (CVSS 7.5). XDM in XFree86 opens a chooserFd TCP socket even when DisplayManager.requestPort is 0, which could allow remote attackers to connect to the port, in violation of the intended restrictions.

How urgent is CVE-2004-0419?

Priority 52/100. High severity; On your watchlist

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References

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