Which products and versions are affected by CVE-2001-0333?

Affected: Internet Information Server (Microsoft) versions 4.0. The full list is in the CVE brief.

Is CVE-2001-0333 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Mar 18, 2001.

Is CVE-2001-0333 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2001-0333?

Public exploit code is available.

Is there a fix for CVE-2001-0333?

Fixed versions are available, including Internet Information Server 5.0.

How urgently should CVE-2001-0333 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2001-0333

HighExploitedPublic exploit

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding ..

Published Jun 27, 2001 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2001-0333 is a high-severity vulnerability (CVSS 7.5 v2) affecting Internet Information Server (Microsoft).
It is exploited in the wild, listed in Industry KEV feed since Mar 18, 2001. Public exploit code is available.
EPSS estimates a 91% probability of exploitation in the next 30 days.
Fixed versions are available, including Internet Information Server 5.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v2

7.5

AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS (30-day exploit likelihood)

91%

Higher than 99.8% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2001-0333 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding .. (dot dot) and "\" characters twice.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Mar 18, 2001	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Internet Information ServerMicrosoft	4.0	5.0

Patched Releases

Internet Information Server

5.0

Timeline

Added to Industry KEV feed
Mar 18, 2001
Publicly disclosed
Jun 27, 2001
Last updated
Apr 15, 2026

References

15 more references in the full CVE brief

FAQ

Common Questions.

Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding ..
Affected: Internet Information Server (Microsoft) versions 4.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Mar 18, 2001.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Internet Information Server 5.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2001-0333 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.