Hackers Take Advantage of an Undiscovered Flaw in Cisco Systems Inc. (CSCO)'s Adaptive Security Appliance 5500-X Series Devices

With strong profitability, Cisco Systems, Inc. (NASDAQ:CSCO) secures a spot on our list of the 11 Most Profitable Blue Chip Stocks to Buy Right Now.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned government entities in an urgent directive on September 25, 2025, about hackers taking advantage of an undiscovered flaw in Cisco Systems, Inc. (NASDAQ:CSCO)’s Adaptive Security Appliance 5500-X Series devices. Just over a day was allotted to agencies to identify impacted devices, check for suspicious activities, and install updates. Cisco recommended users to heed its advice in order to reduce vulnerability after confirming the sophisticated attack and linking it to the ArcaneDoor cyberespionage gang.

The same day, Cisco Systems, Inc. (NASDAQ:CSCO) revealed a new software solution that allows developers to divide computing tasks among heterogeneous quantum machines by integrating quantum computers from several suppliers into a single cloud environment. These programs demonstrate Cisco Systems, Inc. (NASDAQ:CSCO)’s twin commitment to advancing cutting-edge networking technologies to serve new quantum computing applications and bolstering cybersecurity for existing networks.

Networking, security, and analytics solutions are designed, developed, and sold globally by Cisco Systems, Inc. (NASDAQ:CSCO), which serves businesses and service providers in the Americas, Europe, the Middle East, Africa, Asia Pacific, Japan, and China. It is one of Most Profitable Stocks.

While we acknowledge the potential of CSCO as an investment, we believe certain AI stocks offer greater upside potential and carry less downside risk. If you're looking for an extremely undervalued AI stock that also stands to benefit significantly from Trump-era tariffs and the onshoring trend, see our free report on the best short-term AI stock.

READ NEXT: 15 Stocks That Will Benefit From AI and 12 Best Quantum Computing Stocks to Buy According to Wall Street Analysts.

Disclosure: None.