vulnerability
Cisco Patches Firewall Zero-Day Exploited for DoS Attacks
High
Summary
Cisco has released patches to address a zero-day vulnerability (CVE-2026-20349) in its firewall software, which allows unauthenticated attackers to cause a denial-of-service attack. Cisco detected active exploitation of this vulnerability in August 2026 and urges customers to apply the fixes immediately to prevent disruption of their security appliances.
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