CVE-2004-2356: Early termination vulnerability in Fizmez Web Server 1.0 allows remote attackers to cause a denial of service

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MEDIUM 5.0DOWNGRADE

CVE-2004-2356 is a medium-severity flaw (CVSS 5.0) affecting fizmez web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Early termination vulnerability in Fizmez Web Server 1.0 allows remote attackers to cause a denial of service (crash) by connecting to the server and then disconnecting without sending any data, which triggers a null pointer dereference.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fizmez

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 22:09 UTCUpdated Record last modified

fizmez fizmez web server DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy fizmez-web-server || rpm -q fizmez-web-server || fizmez-web-server --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison fizmez-web-server sudo apt install fizmez-web-server=<VERSION_BEFORE_1.0> sudo apt-mark hold fizmez-web-server

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

dnf --showduplicates list fizmez-web-server sudo dnf downgrade fizmez-web-server-<VERSION_BEFORE_1.0> sudo dnf versionlock add fizmez-web-server

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.

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-2004-2356?

fizmez web server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2356 being exploited?

CVE-2004-2356 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-2004-2356 affect?

CVE-2004-2356 affects fizmez web server. Severity is medium (CVSS 5.0). Early termination vulnerability in Fizmez Web Server 1.0 allows remote attackers to cause a denial of service (crash) by connecting to the server and then disconnecting without sending any data, which triggers a null pointer dereference.

How urgent is CVE-2004-2356?

Priority 44/100. Public exploit reference

References

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