# Availability

If an attack renders information unavailable, such as when a system crashes or through a DDoS attack, availability is negatively impacted. Availability has three possible values: None (N) – There is no loss of availability, Low (L) – Availability might be intermittently limited, or performance might be negatively impacted, as a result of a successful attack, High (H) – There is a complete loss of availability of the impacted system or information.


## Values

| Name                  | Value                 |
| --------------------- | --------------------- |
| `AvailabilityUnknown` |                       |
| `AvailabilityNone`    | none                  |
| `AvailabilityLow`     | low                   |
| `AvailabilityHigh`    | high                  |