This cybersecurity brief for October 20, 2025, covers a series of high-impact events. CISA has added five actively exploited vulnerabilities to its KEV catalog, mandating urgent patching. In a significant supply-chain threat, a nation-state actor breached F5, stealing BIG-IP source code. Meanwhile, the Prosper lending platform disclosed a massive data breach affecting 17.6 million users, and the Cl0p ransomware gang is exploiting a new zero-day in Oracle E-Business Suite. These incidents highlight escalating threats across patch management, supply chain security, and data protection.
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