The decentralized finance (DeFi) sector has achieved a significant milestone, reducing exploit losses by 90% since 2020. According to recent data, daily loss rates have decreased to 0.0014% by 2024, down from 30.07% annualized losses in 2020. This improvement reflects the sector's evolution into a more mature financial infrastructure, marked by five distinct security phases, culminating in the 'Comprehensive Security Achievement' of 2024. The shift in attack patterns has seen a decline in yield aggregators as primary targets, with trading platforms and automated market makers (AMMs) now more frequently targeted. Additionally, private key compromises have emerged as a growing threat. The lending sector has notably improved its security, achieving a 98.4% reduction in losses, with daily loss rates now at 0.00128%.