FlexRIC v2.0.0 contains a denial of service vulnerability where malformed E42_RIC_SUBSCRIPTION_REQUEST messages with empty ricEventTriggerDefinition fields can crash the iApp process. The vulnerability stems from a cross-layer validation mismatch between the E42 decoder and E2AP encoder. Remote unauthenticated attackers can exploit this flaw to cause SIGABRT crashes on port 36422. This affects the FlexRIC framework used in O-RAN telecommunications infrastructure. The issue represents a critical availability impact for network operations.