CVE-2009-4445: Microsoft Internet Information Services

Medium severity, CVSS 6.0. EPSS: 12.8% chance of exploitation in the next 30 days.

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.

Affected products

• Microsoft Internet Information Services: up to and including 6.0

Published 2009-12-29. Last modified 2026-06-16.