Frequency
5
occurrences
First Seen
December 17, 2025
Last Seen
January 16, 2026
Related Threat Clusters
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Cisco Fixes Critical AsyncOS Vulnerability Under Attack
Cisco has addressed a maximum-severity vulnerability in AsyncOS, tracked as CVE-2025-20393, which has been actively exploited for at least a month. The flaw affects Secure Email Gateway (SEG) and Secure Email and Web…
11 articles · Updated January 15, 2026 -
Cisco Confirms Exploitation of AsyncOS Zero-Day by Chinese Hackers
Cisco has reported an unpatched zero-day vulnerability (CVE-2025-20393) in its AsyncOS software, affecting Secure Email Gateway and Secure Email and Web Manager appliances. The vulnerability is being actively exploited…
5 articles · Updated December 17, 2025
Recent Intelligence Reports
- Cisco finally fixes AsyncOS zero — Bleepingcomputer · January 16, 2026
- Attacks pummeling Cisco AsyncOS 0-day since late November — Theregister · December 17, 2025
- Attacks pummeling Cisco AsyncOS 0 — Theregister · December 17, 2025
- Cisco warns of unpatched AsyncOS zero — Bleepingcomputer · December 17, 2025
- UAT — Blog.Talosintelligence · December 17, 2025