Mean time to respond

MTTR captures how quickly a security team acts once it knows something is wrong. Containment actions include isolating a compromised device, disabling an account, revoking sessions, blocking a malicious address or removing a phishing email from every inbox. Faster containment limits how far an incident spreads and how much it costs.

The acronym can mean different things. Some providers use it for mean time to respond (the first action), others for mean time to remediate or recover (full resolution). Both are useful, but they are not comparable, so confirm the definition when reviewing provider reports or contracts.

Several factors drive MTTR: whether the responder has authority to act without waiting for approval, whether the tools allow remote containment, whether playbooks and automation exist for common incidents, and whether contacts and escalation paths are current. For SMBs using MDR, agreeing in advance which actions the provider may take on its own is one of the simplest ways to reduce MTTR, especially outside business hours.