What is CVE-2009-3023?

CVE-2009-3023 is a vulnerability in Microsoft Internet Information Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2009-08-31.

Is CVE-2009-3023 known to be exploited?

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

Buffer overflow in Microsoft Internet Information Server

CVE-2009-3023

Buffer overflow in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 6.0 allows remote authenticated users to execute arbitrary code via a crafted NLST (NAME LIST) command that uses wildcards, leading to memory corruption, aka "IIS FTP Service RCE and DoS Vulnerability."

Vulnerability class: Buffer Overflow

Published 2009-08-31 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 9.0 (High). Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.909 (99.8th percentile), scored 2026-10-16.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.909 · newest: 0.909 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

rapid7/metasploit-framework

References

support.microsoft.com/default.aspx (vendor-advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:6080 (signature, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/36189 (Exploit, VDB Entry, Third Party Advisory, vdb-entry)
www.exploit-db.com/exploits/9541 (Exploit, VDB Entry, Third Party Advisory, exploit)
www.us-cert.gov/cas/techalerts/TA09-286A.html (US Government Resource, Third Party Advisory, third-party-advisory)
www.vupen.com/english/advisories/2009/2481 (Third Party Advisory, vdb-entry)
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-053 (vendor-advisory, Patch, Vendor Advisory)
www.exploit-db.com/exploits/9559 (Exploit, VDB Entry, Third Party Advisory, exploit)
www.kb.cert.org/vuls/id/276653 (US Government Resource, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2009-3023?: CVE-2009-3023 is a vulnerability in Microsoft Internet Information Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2009-08-31.
Is CVE-2009-3023 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.