# Cisco drops another exploited zero-day, this time a perfect 10

DevFeed: [Cisco drops another exploited zero-day, this time a perfect 10](<https://devfeed.tech/articles/cisco-drops-another-exploited-zero-day-this-time-a-perfect-10-41312.md>)

Original publisher: [Read original article](<https://www.theregister.com/security/2026/09/17/cisco-drops-another-exploited-zero-day-this-time-a-perfect-10/5297180>)

Author: Carly Page

Published: 2026-09-17T12:40:00Z

Content type: news

Language: en

Sources: [www.theregister.com - Articles](<https://devfeed.tech/sources/www-theregister-com-articles.md>)

Topics: [Cisco](<https://devfeed.tech/topics/cisco.md>), [Authentication](<https://devfeed.tech/topics/authentication.md>), [Security](<https://devfeed.tech/topics/security.md>), [patches](<https://devfeed.tech/topics/patches.md>)

Tags: [authentication-bypass](<https://devfeed.tech/tags/authentication-bypass.md>), [cisco](<https://devfeed.tech/tags/cisco.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [security](<https://devfeed.tech/tags/security.md>), [zero-day](<https://devfeed.tech/tags/zero-day.md>)

## AI overview

Cisco's ISE authentication bypass is under active attack, following another Cisco zero-day that prompted administrators to urgently apply patches.

## Source excerpt

ISE authentication bypass under active attack just days after another Cisco zero-day sent admins scrambling to patch