How severe is CVE-2009-3023?

CVE-2009-3023 has a CVSS 2.0 base score of 9.0, rated critical severity.

Is CVE-2009-3023 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 91% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3023?

CVE-2009-3023 affects Microsoft Internet Information Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-3023?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-3023 published?

CVE-2009-3023 was published on 2009-08-31 and last updated on 2026-06-16.

CVE-2009-3023

CVE-2009-3023 is a critical-severity vulnerability in Microsoft Internet Information Server with a CVSS 2.0 base score of 9.0. Its EPSS exploit-prediction score of 91% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 2.0 base score 9.0)
EPSS exploit prediction: 91% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Microsoft Internet Information Server
Published: 2009-08-31
Last modified: 2026-06-16

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."

Frequently asked questions

What is 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."
How severe is CVE-2009-3023?: CVE-2009-3023 has a CVSS 2.0 base score of 9.0, rated critical severity.
Is CVE-2009-3023 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 91% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3023?: CVE-2009-3023 affects Microsoft Internet Information Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-3023?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-3023 published?: CVE-2009-3023 was published on 2009-08-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_information_server:*:*:*:*:*:*:*:*

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