L2 Network Security Control Bypass Vulnerabilities Affect Numerous Cisco Products

Network Security

This week, Cisco confirmed that bypass vulnerabilities in the Layer-2 (L2) network security controls affect tens of its enterprise routers and switches.

By sending specially crafted packets that would cause a denial-of-service (DoS) or enable them to conduct a man-in-the-middle (MitM) attack, an attacker can get around the security measures offered by these enterprise devices. The Ethernet encapsulation protocols’ L2 network security controls contained a total of four medium-severity security flaws, according to an advisory from the CERT Coordination Center (CERT/CC) at Carnegie Mellon University.

These vulnerabilities represent a different type of bypass of Layer 2 network packet inspection functionality.

Read More: L2 Network Security Control Bypass Flaws Impact Multiple Cisco Products

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