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Cisco Firewalls Targeted by New Attack Variant Exploiting Critical Vulnerabilities

First seen 2 Dec 2025, 18:33 UTC • Esecurityplanet

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Cisco has reported ongoing attacks against its firewalls, specifically targeting vulnerabilities CVE-2025-20333 and CVE-2025-20362. These flaws allow remote code execution and unauthorized access, leading to potential denial-of-service conditions. The attacks have been active for at least six months, prompting Cisco to issue urgent patching guidance to affected customers.

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Cisco Firewalls Targeted by New Attack Variant Exploiting Critical Vulnerabilities

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