CISA published an advisory for CVE-2025-13483, a critical authentication bypass vulnerability in SiRcom SMART Alert (SiSA) Version 3.0.48. The vulnerability allows unauthenticated attackers to bypass login screens using browser developer tools and gain unauthorized access to backend APIs. Successful exploitation could enable remote activation or manipulation of emergency sirens. The vulnerability has a CVSS v3.1 score of 9.1 and CVSS v4 score of 8.8. SiRcom did not respond to CISA's coordination efforts. The system is used worldwide in critical infrastructure sectors including Emergency Services, Government Facilities, and Defense Industrial Base.