TL;DR 📌
A medium-severity vulnerability in Cisco IOS XR Software allows unauthenticated remote attackers to bypass access control lists (ACLs) on the management interface for SSH, NetConf, and gRPC features. Users are advised to upgrade to fixed software releases or implement workarounds.
What happened 🕵️♂️
A vulnerability was identified in the management interface ACL processing feature of Cisco IOS XR Software. This flaw allows unauthenticated remote attackers to bypass configured ACLs, potentially leading to unauthorized access to management features like SSH, NetConf, and gRPC. The issue arises because management interface ACLs are not enforced on certain Linux-handled features within the Packet I/O infrastructure.