CVE-2011-0989: Mono

Medium severity, CVSS 5.8. EPSS: 2.7% chance of exploitation in the next 30 days.

The RuntimeHelpers.InitializeArray method in metadata/icall.c in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, does not properly restrict data types, which allows remote attackers to modify internal read-only data structures, and cause a denial of service (plugin crash) or corrupt the internal state of the security manager, via a crafted media file, as demonstrated by modifying a C# struct.

Affected products

• Mono Mono: any version
• Novell Moonlight: version 2.0 only; version 2.3.0 only; version 2.4 only; version 2.31 only; version 3.0 only; version 3.99 only

Published 2011-04-13. Last modified 2026-06-16.