'They mopped the floor with me and pulled every childish game they could': Disgruntled researcher releases second major Windows zero-day — claims Microsoft 'would ruin my life, and they did'

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• Researcher “Chaotic Eclipse” discloses new Microsoft Defender zero‑day dubbed RedSun
• Flaw enables local privilege escalation to SYSTEM by abusing Defender’s file rewrite behavior
• Comes days after BlueHammer release; Microsoft says it investigates and supports coordinated disclosure

The same disgruntled researcher who recently disclosed a zero-day vulnerability in Windows has now done it again, this time targeting Microsoft Defender, the operating system’s native antivirus solution.