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Critical Cisco Firewall Zero-Day Demands Immediate Patch

🔴 A critical zero-day vulnerability (CVE-2025-20363) in Cisco firewall and IOS families requires immediate patching, US CISA and the UK NCSC warned. Cisco says the flaw is caused by improper validation of user-supplied HTTP input and can allow remote arbitrary code execution as root when exploited. Affected products include Cisco Secure Firewall ASA, FTD, and certain IOS/IOS XE/IOS XR builds; Cisco has released fixes and advises there are no viable workarounds.