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Cisco’s critical comms bug hits perfect 10 severity

A newly disclosed security flaw in Cisco products has received the highest possible severity score of 10 out of 10. This critical vulnerability affects certain Cisco Catalyst switches, widely used in enterprise networks. The flaw resides in the software’s handling of specific IPv6 packets. An attacker could exploit this weakness remotely without needing authentication, potentially leading to a denial-of-service condition, causing devices to reload unexpectedly. This can severely disrupt network operations. Cisco has released software updates to address this issue and strongly urges customers using the affected hardware to patch immediately to protect their infrastructure from potential attacks. Identifying and applying the necessary security patches is crucial to mitigate the significant risk posed by this severe vulnerability. Ignoring this could leave networks exposed to serious downtime and operational impact.

Source: https://go.theregister.com/feed/www.theregister.com/2025/07/02/cisco_patch_cvss/

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