Cisco patches new Secure Email Gateway zero-day exploited in attacks

First reported 14 Oct, 17:29 UTCSource: BleepingComputer + 1 moreLast editorial activity 14 Oct, 17:29 UTC

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What happened

Cisco has patched (a fix the maker issues for a flaw in its software) another actively exploited zero-day (a flaw already being used in attacks before a fix exists) flaw in its Secure Email Gateway (SEG) that lets remote unauthenticated attackers execute commands with root privileges. Cisco is a telecommunications and networking hardware company based in San Jose, founded in 1984, which employed about 86,000 people in 2025.

Sources & evidence

BleepingComputer Reporting source
Cisco patches new Secure Email Gateway zero-day exploited in attacks ↗
https://www.bleepingcomputer.com/news/security/cisco-patches-actively-exploited-secure-email-gateway-zero-day/
The Hacker News Reporting source
Cisco Warns of Active Attacks Exploiting New Critical Secure Email Gateway Vulnerability ↗
https://thehackernews.com/2026/10/cisco-warns-of-active-attacks.html

What happened

Sources & evidence

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