Hundreds of Cisco customers are vulnerable to new Chinese hacking campaign, researchers say | TechCrunch

On Wednesday, Cisco revealed that a group of Chinese government-backed hackers is exploiting a vulnerability to target its enterprise customers who use some of the company’s most popular products.

Cisco has not said how many of its customers have already been hacked, or may be running vulnerable systems. Now, security researchers say there are hundreds of Cisco customers who could potentially be hacked.

Piotr Kijewski, the chief executive of the nonprofit Shadowserver Foundation that scans and monitors the internet for hacking campaigns, told TechCrunch that the scale of exposure “seems more in the hundreds rather than thousands or tens of thousands.”

Kijewski said the foundation was not seeing widespread activity, presumably because “current attacks are targeted.” 

Shadowserver has a page where it’s tracking the number of systems that are exposed and vulnerable to the flaw disclosed by Cisco, named officially as CVE-2025-20393. The vulnerability is known as…