CVE-2004-0634: The SMB SID snooping capability in Ethereal 0.9.15 to 0.10.4 allows remote attackers to cause a denial of serv

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MEDIUM 5.0WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2004-0634 is a medium-severity flaw (CVSS 5.0) affecting ethereal, linux, mandrake linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The SMB SID snooping capability in Ethereal 0.9.15 to 0.10.4 allows remote attackers to cause a denial of service (process crash) via a handle without a policy name, which causes a null dereference.

Why this priority

EPSS top 7%: very likely to be exploited
On your watchlist

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	5.3% (top 7%)
CISA exploited list	No
Published	2004-12-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ethereal group · gentoo · mandrakesoft · redhat

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

Am I affected?

Timeline

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

ethereal group ethereal DOWNGRADE

Affected: 0.9.15 · 0.10.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.15

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.15 (Debian / Ubuntu)

apt-cache madison ethereal sudo apt install ethereal=<VERSION_BEFORE_0.9.15> sudo apt-mark hold ethereal

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

dnf --showduplicates list ethereal sudo dnf downgrade ethereal-<VERSION_BEFORE_0.9.15> sudo dnf versionlock add ethereal

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: 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.

mandrakesoft mandrake linux MITIGATE

Affected: 9.2 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.2

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 linux advanced workstation MITIGATE

Affected: 2.1

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-2004-0634?

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

Is CVE-2004-0634 being exploited?

CVE-2004-0634 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-2004-0634 affect?

CVE-2004-0634 affects ethereal, linux, mandrake linux. Severity is medium (CVSS 5.0). The SMB SID snooping capability in Ethereal 0.9.15 to 0.10.4 allows remote attackers to cause a denial of service (process crash) via a handle without a policy name, which causes a null dereference.

How urgent is CVE-2004-0634?

Priority 46/100. EPSS top 7%: very likely to be exploited; On your watchlist

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References

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