Which products and versions are affected by CVE-2003-0109?

Affected: Windows 2000 (Microsoft); Windows 2000 Terminal Services (Microsoft). The full list is in the CVE brief.

Is CVE-2003-0109 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Jun 20, 2017.

Is CVE-2003-0109 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-2003-0109?

Public exploit code is available.

Is there a fix for CVE-2003-0109?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2003-0109 be patched?

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

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Vulnerability Intelligence

CVE-2003-0109

HighExploitedPublic exploit

Buffer overflow in ntdll.dll on Microsoft Windows NT 4.0, Windows NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP allows remote attackers to execute arbitrary code, as demonstrated via a WebDAV request to IIS 5.0.

Published Mar 31, 2003 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2003-0109 is a high-severity vulnerability (CVSS 7.5 v2) affecting Windows 2000 (Microsoft), Windows 2000 Terminal Services (Microsoft).
It is exploited in the wild, listed in Industry KEV feed since Jun 20, 2017. Public exploit code is available.
EPSS estimates a 86% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
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)

86%

Higher than 99.7% 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-2003-0109 brief as a PDF

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

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Jun 20, 2017	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

8 affected entries in total

Product	Affected versions	Fixed in
Windows 2000Microsoft	See advisory	n/a
Windows 2000 Terminal ServicesMicrosoft	See advisory	n/a

Timeline

Publicly disclosed
Mar 31, 2003
Added to Industry KEV feed
Jun 20, 2017
Last updated
Apr 15, 2026

References

patchCA-2003-09
patch20030317 Microsoft IIS WebDAV Remote Compromise Vulnerability
patchhttp-webdav-long-request(11533)
patch7116
exploitVulnCheck exploitation report

15 more references in the full CVE brief

FAQ

Common Questions.

Buffer overflow in ntdll.dll on Microsoft Windows NT 4.0, Windows NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP allows remote attackers to execute arbitrary code, as demonstrated via a WebDAV request to IIS 5.0.
Affected: Windows 2000 (Microsoft); Windows 2000 Terminal Services (Microsoft). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jun 20, 2017.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2003-0109 Running On Your Attack Surface?

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