CVE-2009-3023

What it is

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."

At a glance

Exploitability

Can be exploited over the network with a login. High risk of data exposure, data tampering, service disruption.

Exploit odds

90.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-08-31 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2009-08-31 20:30 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 90.9% in the next 30 days (EPSS).
• Severity: 9.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.
• It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published

2009-08-31 20:30 UTC

Last modified

2026-06-16 23:10 UTC

Exploit probability

90.9% · EPSS, next 30 days

Weakness

CWE-120 · Classic buffer overflow

Record status

Modified

Affected

• Microsoft Internet Information Server ≤ 6.0

Attack profile CVSS 2.0 · 9.0

Attack vector

Network

Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-3023.md and follow it. Check whether this project is affected by CVE-2009-3023. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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