> There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised. The attacker is able to modify any files on the target system.
Quote from the CVSS specification
Vulnerabilities with this tag were given a CVSS rating as part of the
requirement to be included into the [National Vulnerability
Database](https://nvd.nist.gov/). You can learn more about what the individual
scores mean in the [CVSS specification