The vulnerability was privately reported to Microsoft by Kaspersky Lab.
According to MITRE statement, the vulnerability has been exploited in the wild in November 2018.
The vulnerability was discovered during the resolution of a Cisco TAC support case and reported by Cisco PSIRT.
Trend Micro has issued a report detailing in the wild exploitation of a publicly disclosed vulnerability in Microsoft Word. According to VirusTotal timestamps, the first wave of exploitation began on October 31, 2018. The vulnerability was disclosed on October 25.
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