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Interlock ransomware exploits critical Cisco firewall zero-day vulnerability weeks before patch
Since late January 2026, the Interlock ransomware gang has actively exploited a critical remote code execution zero-day vulnerability (CVE-2026-20131) in Cisco Secure Firewall Management Center (FMC) software.
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- Interlock Ransomware Exploited Cisco Firewall Flaw for WeeksBankInfoSecurity
- Amazon security boss says crims abused max-security Cisco firewall flaw weeks before disclosureThe Register Security