CVE-2011-0026: Microsoft Data Access Components

High severity, CVSS 9.3. EPSS: 34.4% chance of exploitation in the next 30 days.

Integer signedness error in the SQLConnectW function in an ODBC API (odbc32.dll) in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2, and Windows Data Access Components (WDAC) 6.0, allows remote attackers to execute arbitrary code via a long string in the Data Source Name (DSN) and a crafted szDSN argument, which bypasses a signed comparison and leads to a buffer overflow, aka "DSN Overflow Vulnerability."

Affected products

• Microsoft Data Access Components: version 2.8 only
• Microsoft Windows Data Access Components: version 6.0 only

Published 2011-01-12. Last modified 2026-06-16.