diff --git a/windows/security/threat-protection/microsoft-defender-atp/tvm-exposure-score.md b/windows/security/threat-protection/microsoft-defender-atp/tvm-exposure-score.md index f73d28e79c..d23e973e81 100644 --- a/windows/security/threat-protection/microsoft-defender-atp/tvm-exposure-score.md +++ b/windows/security/threat-protection/microsoft-defender-atp/tvm-exposure-score.md @@ -41,15 +41,6 @@ The card gives you a high-level view of your exposure score trend over time. Any ## How it works -Threat and vulnerability management introduces a new exposure score metric, which visually represents how exposed your devices are to imminent threats. - -The exposure score is continuously calculated on each device in the organization. It is influenced by the following factors: - -- Weaknesses, such as vulnerabilities discovered on the device -- External and internal threats such as public exploit code and security alerts -- Likelihood of the device to get breached given its current security posture -- Value of the device to the organization given its role and content - The exposure score is broken down into the following levels: - 0–29: low exposure score @@ -58,6 +49,46 @@ The exposure score is broken down into the following levels: You can remediate the issues based on prioritized [security recommendations](tvm-security-recommendation.md) to reduce the exposure score. Each software has weaknesses that are transformed into recommendations and prioritized based on risk to the organization. +## How the score is calculated + +The exposure score is continuously calculated on each device in the organization. It is scored & evaluated based on the following categories: + +- **Threats** - external and internal threats such as public exploit code and security alerts +- **Likelihood** - likelihood of the device to get breached given its current security posture +- **Value** - value of the device to the organization given its role and content + +**Device exposure score** = (Threats + Likelihood) x Value + +**Organization exposure score** = Avg (All device exposure scores) taking into account organization value multipliers + +### Threats + +Points are added based on whether the device has any vulnerabilities or misconfigurations, determined by the Common Vulnerability Scoring System (CVSS) base score. + +Further points are added based on: + +- Exploits availability and whether the exploit is verified or ranked +- A threat campaign is linked to the vulnerability or misconfiguration + +### Likelihood + +Points are added based on whether any of the following factors are true: + +- The device is internet facing +- Specific compensating controls are misconfigured +- An exploit attempt is linked directly to a threat spotted in the organization + +### Value + +Points are added based on whether any of the following factors are true for a device: + +- Contains high business impact (HBI) data +- Marked as a High Value Asset (HVA) or serves as an important server role (e.g. AD, DNS) +- Runs a business critical app (BCA) +- Used by a marked high value user (HVU) (e.g. domain admin, CEO) + +If a device is valuable to your organization, it should increase the total organization exposure score. + ## Reduce your threat and vulnerability exposure Lower your threat and vulnerability exposure by remediating [security recommendations](tvm-security-recommendation.md). Make the most impact to your exposure score by remediating the top security recommendations, which can be viewed in the [threat and vulnerability management dashboard](tvm-dashboard-insights.md).