CVE-2024-39542 is a Denial-of-Service (DoS) vulnerability affecting Juniper Networks Junos OS and Junos OS Evolved. This improper validation of input can cause the Packet Forwarding Engine (PFE) to crash. While the CVSS score is relatively low, SOCRadar's Vulnerability Risk Score (SVRS) is 30, indicating a moderate risk. In specific scenarios, such as devices configured with SFLOW and ECMP receiving sampled transit traffic, or receiving malformed CFM packets, the packetio process crashes. This leads to an evo-aftman crash, causing the FPC to stop working until restarted. This vulnerability is significant as it impacts availability, potentially disrupting network operations on MX Series, ACX Series and PTX Series devices. Upgrade to a fixed software version to mitigate this threat.