What is CVE-2009-0093?

CVE-2009-0093 is a vulnerability in Microsoft Windows 2000, classified under Improper Input Validation. Published 2009-03-11.

Is CVE-2009-0093 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Microsoft Windows 2000

CVE-2009-0093

Windows DNS Server in Microsoft Windows 2000 SP4, Server 2003 SP1 and SP2, and Server 2008, when dynamic updates are enabled, does not restrict registration of the "wpad" hostname, which allows remote authenticated users to hijack the Web Proxy Auto-Discovery (WPAD) feature, and conduct man-in-the-middle attacks by spoofing a proxy server, via a Dynamic Update request for this hostname, aka "DNS Server Vulnerability in WPAD Registration Vulnerability," a related issue to CVE-2007-1692.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2009-03-11 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 3.5 (Low). Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.170 (97.0th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.170 · newest: 0.170 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:6138 (signature, vdb-entry)
www.us-cert.gov/cas/techalerts/TA09-069A.html (US Government Resource, third-party-advisory)
blog.ncircle.com/blogs/vert/archives/2009/03/successful_exploit_renders_mic.html
www.vupen.com/english/advisories/2009/0661 (vdb-entry)
secunia.com/advisories/34217 (third-party-advisory)
osvdb.org/52519 (vdb-entry)
www.securityfocus.com/bid/33989 (vdb-entry)
support.avaya.com/elmodocs2/security/ASA-2009-083.htm
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-008 (vendor-advisory)
www.securitytracker.com/id (vdb-entry)

Frequently asked questions

What is CVE-2009-0093?: CVE-2009-0093 is a vulnerability in Microsoft Windows 2000, classified under Improper Input Validation. Published 2009-03-11.
Is CVE-2009-0093 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.