# Critical Cisco email security flaw is being exploited by attackers

DevFeed: [Critical Cisco email security flaw is being exploited by attackers](<https://devfeed.tech/articles/cisco-email-security-boxes-can-be-rooted-by-an-email-26960.md>)

Original publisher: [Read original article](<https://www.theregister.com/security/2026/09/15/cisco-email-security-boxes-can-be-rooted-by-an-email/5296604>)

Author: Carly Page

Published: 2026-09-15T16:01:00Z

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>), [Security](<https://devfeed.tech/topics/security.md>), [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>)

Tags: [cisco](<https://devfeed.tech/tags/cisco.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [email](<https://devfeed.tech/tags/email.md>), [security](<https://devfeed.tech/tags/security.md>)

## AI overview

Attackers are exploiting a critical vulnerability in Cisco email security appliances. Cisco warns that attackers may be able to conceal their activity after gaining access.

## Source excerpt

Attackers already exploiting the critical flaw, and Cisco warns they may be able to cover their tracks once they're in