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Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security Appliances
Cisco has alerted users to a maximum-severity zero-day flaw in Cisco AsyncOS software that has been actively exploited by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686 in attacks targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager.
The networking equipment major said it became aware of the intrusion campaign on December 10, 2025, and that it has singled out a “limited subset of appliances” with certain ports open to the internet. It’s currently not known how many customers are affected.
“This attack allows the threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance,” Cisco said in an advisory. “The ongoing investigation has revealed evidence of a persistence mechanism planted by the threat actors to maintain a degree of control over compromised appliances.”
Kimwolf Botnet Hijacks 1.8 Million Android TVs, Launches Large-Scale DDoS Attacks
A new distributed denial-of-service (DDoS) botnet known as Kimwolf has enlisted a massive army of no less than 1.8 million infected devices comprising Android-based TVs, set-top boxes, and tablets, and may be associated with another botnet known as AISURU, according to findings from QiAnXin XLab.
“Kimwolf is a botnet compiled using the NDK [Native Development Kit],” the company said in a report published today. “In addition to typical DDoS attack capabilities, it integrates proxy forwarding, reverse shell, and file management functions.”
The hyper-scale botnet is estimated to have issued 1.7 billion DDoS attack commands within a three-day period between November 19 and 22, 2025, around the same time one of its command-and-control (C2) domains – 14emeliaterracewestroxburyma02132[.]su – came first in Cloudflare’s list of top 100 domains, briefly even surpassing Google.