Cisco FMC Zero-Day Among 31 High-Impact Vulnerabilities Exploited in March

Insikt Group reports that 31 high-impact vulnerabilities were actively exploited in March 2026 — including a Cisco Secure Firewall Management Center zero-day (CVE-2026-20131) weaponized by the Interlock ransomware group — with exploitation chains delivering ELF payloads, custom RATs, and ransomware. The report highlights 9 RCEs, public PoCs for 10 flaws, continued abuse of legacy CVEs, cross-platform targeting (Microsoft, Apple, Google), and recommends urgent patching, exposure validation, and use of detection templates and risk scoring.