SOURCE FACT
Microsoft · Silverlight
Microsoft Silverlight mishandles negative offsets during decoding, which allows attackers to execute remote code or cause a denial-of-service (DoS).
Required action
The impacted products are end-of-life and should be disconnected if still in use.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2016-0034
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