CVE-2001-0303: tstisapi.dll in Pi3Web 1.0.1 web server allows remote attackers to determine the physical path of the server v

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MEDIUM 5.0DOWNGRADE

CVE-2001-0303 is a medium-severity flaw (CVSS 5.0) affecting pi3web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tstisapi.dll in Pi3Web 1.0.1 web server allows remote attackers to determine the physical path of the server via a URL that requests a non-existent file.

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	1.5% (top 26%)
CISA exploited list	No
Published	2001-05-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: pi3

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

Am I affected?

Timeline

2001-05-03 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

pi3 pi3web DOWNGRADE

Affected: 1.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1

1. Check installed version

apt-cache policy pi3web || rpm -q pi3web || pi3web --version

2. No fixed release: DOWNGRADE to a release before 1.0.1 (Debian / Ubuntu)

apt-cache madison pi3web sudo apt install pi3web=<VERSION_BEFORE_1.0.1> sudo apt-mark hold pi3web

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

dnf --showduplicates list pi3web sudo dnf downgrade pi3web-<VERSION_BEFORE_1.0.1> sudo dnf versionlock add pi3web

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-2001-0303?

pi3web: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0303 being exploited?

CVE-2001-0303 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-2001-0303 affect?

CVE-2001-0303 affects pi3web. Severity is medium (CVSS 5.0). tstisapi.dll in Pi3Web 1.0.1 web server allows remote attackers to determine the physical path of the server via a URL that requests a non-existent file.

How urgent is CVE-2001-0303?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2008-6938 MEDIUM 4.3 UPGRADE Pi3Web 2.0.3 before PL2, when installed on Windows as a desktop application and without using the Pi3Web/Conf/
CVE-2003-1032 MEDIUM 5.0 DOWNGRADE Pi3Web web server 2.0.2 Beta 1, when the Directory Index is configured to use the "Name" column and sort using
CVE-2003-0276 MEDIUM 5.0 DOWNGRADE Buffer overflow in Pi3Web 2.0.1 allows remote attackers to cause a denial of service (crash) and possibly exec
CVE-2002-0433 MEDIUM 5.0 DOWNGRADE Pi3Web 2.0.0 allows remote attackers to view restricted files via an HTTP request containing a "*" (wildcard o
CVE-2002-0142 HIGH 7.5 DOWNGRADE CGI handler in John Roy Pi3Web for Windows 2.0 beta 1 and 2 allows remote attackers to cause a denial of servi

References

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