Amazon Threat Intelligence has issued an alert regarding a significant ransomware campaign, Interlock, which is leveraging the recently disclosed zero-day vulnerability in Cisco Secure Firewall Management Center (FMC) Software identified as CVE-2026-20131. This vulnerability, rated with a CVSS score of 10.0, stems from insecure deserialization of user-supplied Java byte streams, enabling an unauthenticated remote attacker to gain root access. The severity and exploitability of this flaw highlight the urgent need for businesses using Cisco FMC to prioritize patching and strengthen their security postures.
For organizations, this incident underscores the critical importance of maintaining up-to-date software and implementing robust security measures to mitigate vulnerabilities. The exploitation of such a high-severity flaw not only poses immediate threats to data integrity and confidentiality but also emphasizes the growing sophistication of ransomware tactics in targeting essential infrastructure. As businesses increasingly integrate AI and cybersecurity solutions, the necessity for proactive threat intelligence and vulnerability management becomes paramount, ensuring that organizations can defend against the evolving landscape of cyber threats.
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*Originally reported by [The Hacker News](https://thehackernews.com/2026/03/interlock-ransomware-exploits-cisco-fmc.html)*