Not reporting all CVEs

[infosecmatters2021]

Several CVEs are not returned when queried. Why won't the API return the information? It is available via the Microsoft Security Catalog.

Go to https://msrc.microsoft.com/update-guide/vulnerability
Select 2016 as the date range
Click Vulnerabilities tab and sort by CVE
No CVE-2016-0099

https://www.cve.org/CVERecord?id=CVE-2016-0099
Links to https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-032
Microsoft Security Catalog: https://www.catalog.update.microsoft.com/Search.aspx?q=ms16-032

Same result using PowerShell:
Get-MsrcSecurityUpdate -Vulnerability CVE-2016-0099
Get-MsrcSecurityUpdate : HTTP Get failed with status code NotFound: Not Found

Other examples:

CVE-2014-1812 - KB2928120
NIST - https://nvd.nist.gov/vuln/detail/CVE-2014-1812
Microsoft Security Bulletin MS14-025 - Important | Microsoft Learn: https:/learn.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-025
Microsoft Security Catalog: https://www.catalog.update.microsoft.com/Search.aspx?q=ms14-025

CVE-2015-2426 - KB3079904
Microsoft Security Bulletin MS15-078
https://www.catalog.update.microsoft.com/Search.aspx?q=ms15-078

CVE-2015-2387 - KB3077657
Microsoft Security Bulletin MS15-077
...

CVE-2015-1635 - KB3042553
Microsoft Security Bulletin MS15-034
...

CVE-2014-6324 – KB3011780
Microsoft Security Bulletin MS14-068
...

CVE-2014-6352 - KB3010788
Microsoft Security Bulletin MS14-064
...