Cisco Issues Emergency Fix for Firewall Zero-Day Under Active Attack
Cisco has issued an urgent warning to organizations worldwide following the discovery of a zero-day vulnerability in its core firewall software. Tracked as CVE-2026-20349, the flaw is currently being exploited in the wild, allowing unauthenticated attackers to trigger a denial-of-service (DoS) condition. Because this vulnerability affects the perimeter of the network—the very place designed to keep threats out—security teams are being urged to prioritize patching immediately. The Nature of the…