An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests, aka 'Windows SMB Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0704, CVE-2019-0821.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0703
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0703