CVE-2016-3367: Microsoft Silverlight

High severity, CVSS 8.8. EPSS: 17.8% chance of exploitation in the next 30 days.

StringBuilder in Microsoft Silverlight 5 before 5.1.50709.0 does not properly allocate memory for string-insert and string-append operations, which allows remote attackers to execute arbitrary code via a crafted web site, aka "Microsoft Silverlight Memory Corruption Vulnerability."

Affected products

• Microsoft Silverlight: version 5.0 only

Published 2016-09-14. Last modified 2026-06-17.