CompTIA Exam Prep - ITF+, A+, Network+, Security+, CySA+

Mean time to remediate (MTTR) is the average time between discovering a vulnerability and fixing it. It is a vulnerability management metric, and it should not be confused with the incident response metrics covered in Mean Time to Detect — that article compares MTTD, MTTA, MTBF and MTTF. This one is about the remediation clock specifically. Mean time to remediate measures how long your known vulnerabilities stay exploitable. It is the window you are handing attackers, expressed as a number. The Acronym Problem Worth clearing up first, because it causes genuine confusion: MTTR is used for at least four different things — mean time to remediate , to repair , to respond , and to recover . Mean time to remediate — vulnerability discovered to vulnerability fixed. Vulnerability management. Mean time to respond — incident detected to incident contained. Incident response. Mean time to repair — failure to service restored. Availability and maintenance. Mean time to recover —...

Mean time to detect (MTTD) is the average time between a security incident beginning and the organization noticing it. It is one of the few security metrics that maps directly onto damage, because almost everything an attacker achieves happens during that window. Every hour an intrusion goes undetected is an hour the attacker spends moving laterally, escalating privileges, and locating your data. The uncomfortable truth behind the metric is that industry-wide dwell times have historically been measured in weeks and months rather than hours. They have improved markedly — partly through better tooling, and partly because ransomware announces itself, which drags the average down for reasons nobody should celebrate. The Family of Metrics MTTD sits in a sequence, and exams test the whole set together. Metric Measures Clock starts Clock stops MTTD — mean time to detect Detection speed Incident begins Someone notices MTTA — mean time to acknowledge Triage responsiveness Alert ...