Interlock Ransomware Exploits Cisco FMC Zero-Day CVE-2026-20131 for Root Access

Summary

Interlock ransomware group has exploited a zero-day vulnerability (CVE-2026-20131) in Cisco Firepower Management Center (FMC) to gain root access to targeted systems. This represents an active exploitation of a previously unknown vulnerability in critical network security infrastructure.

Key Points

• CVE-2026-20131 is a zero-day vulnerability in Cisco Firepower Management Center being actively exploited by Interlock ransomware
• The vulnerability allows attackers to escalate privileges and gain root access to affected Cisco FMC systems
• This attack targets critical network security infrastructure, potentially compromising organizations' security posture

Takeaways

• Security teams should immediately check for Cisco FMC patches and apply emergency mitigations if available
• Organizations using Cisco FMC should implement additional monitoring and access controls around these systems until patches are deployed

Topics: zero-day, ransomware, cisco, privilege-escalation, network-security, vulnerability-management