How severe is CVE-2009-3023?

No CVSS score has been assigned to CVE-2009-3023 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2009-3023?

Affected package information for CVE-2009-3023 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2009-3023?

No fixed version has been published for CVE-2009-3023 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2009-3023 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2009-3023, including 3 documented proof-of-concept exploits on Exploit-DB and 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2009-3023?

CVE-2009-3023 has an EPSS (Exploit Prediction Scoring System) score of 90.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2009-3023?

CVE-2009-3023 is classified as CWE-120 (CWE-120). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2009-3023?

CVE-2009-3023 affects microsoft internet information server. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2009-3023 published, and has it been updated?

CVE-2009-3023 was published on August 31, 2009 and was last updated on April 23, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

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…

Published

Aug 31, 2009

Updated

Apr 23, 2026

Affected

0 pkgs

Patched

None yet

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

90.9%probability of exploitation in next 30 days

Very High Risk100th percentile+13.19%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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."

Affected Products

1 product · 1 configurations

Application

internet information servermicrosoft

≥ 5.0 && ≤ 6.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-16740remotewindows✓ Verified

Microsoft IIS FTP Server - NLST Response Overflow (MS09-053) (Metasploit)

by Metasploit · Nov 12, 2010

Exploit-DB Source

EDB-9541remotewindows✓ Verified

Microsoft IIS 5.0/6.0 FTP Server (Windows 2000) - Remote Stack Overflow

by kingcope · Aug 31, 2009

Exploit-DB Source

EDB-9559remotewindows✓ Verified

Microsoft IIS 5.0 FTP Server (Windows 2000 SP4) - Remote Stack Overflow

by muts · Sep 1, 2009

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2009-3023 in your stack?

O3 detects CVE-2009-3023 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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