An issue was discovered in Yealink Configuration Encrypt Tool (AES version) and Yealink Configuration Encrypt Tool (RSA version before 1.2). There is a single hardcoded key (used to encrypt provisioning documents) across customers' installations.

Insecure AES key in Yealink Configuration Encrypt Tool below verrsion 1.2. A single, vendorwide, hardcoded AES key in the configuration tool used to encrypt provisioning documents was leaked leading to a compromise of confidentiality of provisioning documents.