CVE-2009-3275: Microsoft Enterprise Library

Medium severity, CVSS 5.0. EPSS: 3.5% chance of exploitation in the next 30 days.

Blocks/Common/Src/Configuration/Manageability/Adm/AdmContentBuilder.cs in Microsoft patterns & practices Enterprise Library (aka EntLib) allows context-dependent attackers to cause a denial of service (CPU consumption) via an input string composed of many \ (backslash) characters followed by a " (double quote), related to a certain regular expression, aka a "ReDoS" vulnerability.

Affected products

• Microsoft Enterprise Library: version 3.1 only; version 4.0 only; version 4.1 only

Published 2009-09-21. Last modified 2026-06-16.