The NCCIC has published an advisory on a missing authentication for critical function vulnerability in Siemens TIM 1531 IRC Modules. All versions prior to 2.0 are affected. Successful exploitation of this vulnerability could allow an attacker to perform arbitrary administrative operations. Siemens recommends upgrading to firmware v2.0. The NCCIC also advises on a series of mitigating measures for these vulnerabilities. NCCIC/ICS-CERT.