How severe is CVE-2009-4445?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 6 out of 10.

What type of vulnerability is CVE-2009-4445?

This is classified as CWE-20, which is a common weakness in software security.

CVE-2009-4445 - MEDIUM Severity | CVSS 6

Vulnerability Description

Microsoft Internet Information Services (IIS), when used in conjunction with unspecified third-party upload applications, allows remote attackers to create empty files with arbitrary extensions via a filename containing an initial extension followed by a : (colon) and a safe extension, as demonstrated by an upload of a .asp:.jpg file that results in creation of an empty .asp file, related to support for the NTFS Alternate Data Streams (ADS) filename syntax. NOTE: it could be argued that this is a vulnerability in the third-party product, not IIS, because the third-party product should be applying its extension restrictions to the portion of the filename before the colon.

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