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 release is recorded for CVE-2009-3023 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2009-3023 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2009-3023 if there is no patch (or I can't update yet)?

Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

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.

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 August 7, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

Not in CISA KEV

CVE-2009-3023 — Microsoft

CVE-2009-3023 is a CWE-120 vulnerability. 7 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

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

Aug 7, 2024

Affected

1 product

Patched

See advisory

Exploits

7 known

Exploitation data as of Oct 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

90.9%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

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-9541remotewindows✓ Verified

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

by kingcope · Aug 31, 2009

Exploit-DB Source

EDB-16740remotewindows✓ Verified

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

by Metasploit · Nov 12, 2010

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

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2009-3023 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

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CVE-2009-3023 — Microsoft

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

Frequently Asked Questions

Is CVE-2009-3023 in your dependencies?