CVE-2024-20253

It’s a security hole in Cisco call/voice and contact-center systems that allows a remote attacker to run commands on the server without any login. Think of it like leaving a “no-password” back door to the building and letting someone not only enter, but also change what the system does. In the worst case, attackers can take full control and disrupt your voice/call services.

This matters if your business runs any of the listed Cisco Unified Communications and Contact Center products (for example, your phone/call-routing system, voicemail, and related contact-center components). The vulnerability can be triggered remotely by a network attacker without authentication, and no user action is needed. Prioritize patching especially if your systems are reachable from the internet or otherwise exposed to untrusted networks/traffic on their listening interfaces.

This is RED because attackers are already exploiting the vulnerability in the wild. Exploitation has been reported to create files on targeted devices using crafted payloads, meaning systems with exposed network access are at immediate risk. Patch without delay and lock down network reachability of the affected interfaces until you’re upgraded.