CVE-2005-0509: Microsoft .NET Framework

Medium severity, CVSS 4.3. EPSS: 15.9% chance of exploitation in the next 30 days.

Multiple cross-site scripting (XSS) vulnerabilities in the Mono 1.0.5 implementation of ASP.NET (.Net) allow remote attackers to inject arbitrary HTML or web script via Unicode representations for ASCII fullwidth characters that are converted to normal ASCII characters, including ">" and "<".

Affected products

• Microsoft .NET Framework: version 1.0 only; version 1.1 only
• Mono Mono: version 1.0.5 only

Published 2005-03-14. Last modified 2026-06-16.