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flag Chinese-linked hackers exploited a Cisco flaw since Nov. 2025, gaining root access; no patch yet, CISA warns.

flag Chinese-government-linked hackers have exploited a critical zero-day vulnerability (CVE-2025-20393) in Cisco Secure Email Gateway and Web Manager systems since late November 2025, gaining root access and deploying persistent backdoors. flag The attacks, attributed to APT group UAT-9686, target internet-exposed devices with Spam Quarantine enabled. flag Cisco has confirmed ongoing activity, no patch is available, and mitigation requires system rebuilds. flag The US CISA has added the flaw to its Known Exploited Vulnerabilities catalog.

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