CVE-2001-0558: T

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MEDIUM 5.0DOWNGRADE

CVE-2001-0558 is a medium-severity flaw (CVSS 5.0) affecting jana web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

T. Hauck Jana Webserver 2.01 beta 1 and earlier allows a remote attacker to create a denial of service via a URL request which includes a MS-DOS device name (i.e. GET /aux HTTP/1.0).

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	7.3% (top 6%)
CISA exploited list	No
Published	2001-08-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: t. hauck

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

Am I affected?

Timeline

2001-08-14 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

t. hauck jana web server DOWNGRADE

Affected: 1.45 · 1.46 · 2.0b2 · 2.0beta1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.45

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.45 (Debian / Ubuntu)

apt-cache madison jana-web-server sudo apt install jana-web-server=<VERSION_BEFORE_1.45> sudo apt-mark hold jana-web-server

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

dnf --showduplicates list jana-web-server sudo dnf downgrade jana-web-server-<VERSION_BEFORE_1.45> sudo dnf versionlock add jana-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.

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: T. Hauck Jana Server 1.45/1.46/2.0 - MS-DOS Device Name Denial of Service

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-2001-0558?

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

Is CVE-2001-0558 being exploited?

CVE-2001-0558 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-2001-0558 affect?

CVE-2001-0558 affects jana web server. Severity is medium (CVSS 5.0). T. Hauck Jana Webserver 2.01 beta 1 and earlier allows a remote attacker to create a denial of service via a URL request which includes a MS-DOS device name (i.e. GET /aux HTTP/1.0).

How urgent is CVE-2001-0558?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

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References

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