In Cisco Vulnerability Management there are a number of background computing jobs that run nightly. One of those jobs produces the reporting numbers displayed on historical data graphs for reporting.
Note: Cisco Vulnerability Management processes background jobs, such as risk meter refreshes, between 1 AM and 5 AM local time in EU and AJPC, and between 10:30 and 1:30 in the US region, excluding Hawaii.
Cisco Vulnerability Management is very dynamic which makes recreating those historical numbers virtually impossible for the following reasons:
- Real time threat data changes vulnerability scores - up and down - as new data is acquired altering vulnerability counts by risk.
- Scanners can re-open vulnerabilities at any time altering open and closed vulnerability counts.
- Tags on assets might change which alters assets counts and scores for risk meters where tags were used to build the risk meter query.
- Assets might change to inactive status which alters risk meter scores and asset and vulnerability counts.
- Asset priority might change at any time which alters the overall asset score and also the risk meter scores of any group that contains the assets.
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