Access Control Vulnerability in Cisco SD-WAN vEdge Software

CVE-2025-20339

What is CVE-2025-20339?

A significant vulnerability exists within the access control list (ACL) processing of IPv4 packets in Cisco SD-WAN vEdge Software. This flaw allows an unauthenticated, remote attacker to circumvent configured ACL rules due to improper enforcement of the implicit deny rule at the end of ACLs. An attacker can exploit this vulnerability by sending unauthorized traffic to an interface on the vulnerable device, effectively bypassing the protective measures designed to restrict access.

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