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Microsoft Silverlight 5 before 5.1.41105.00 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read or write access) via unspecified open and close requests, aka "Microsoft Silverlight RCE Vulnerability."
Use CWE-119, Microsoft vendor hub and Silverlight product page to widen CVE-2015-6166 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2016-0034, CVE-2015-6108 and CVE-2015-2464 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.