CVE-2025-0556

CVE-2025-0556 is a vulnerability in Progress® Telerik® Report Server, affecting versions prior to 2025 Q1 (11.0.25.211) when using the older .NET Framework implementation. It involves the communication of non-sensitive information between the service agent process and app host process over an unencrypted tunnel, exposing this traffic to local network sniffing. Published on 2025-02-12, the issue is classified under CWE-319 (Cleartext Transmission of Sensitive Information) with a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

An attacker with access to the local network can exploit this vulnerability by sniffing the unencrypted traffic between the processes. The attack requires no privileges (PR:N) and has low complexity (AC:L), though it necessitates user interaction (UI:R). Exploitation can result in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H).

The Telerik knowledge base advisory at https://docs.telerik.com/report-server/knowledge-base/kb-security-cleartext-transmission-cve-2025-0556 provides details on mitigation, with upgrading to Telerik Report Server 2025 Q1 (11.0.25.211) or later addressing the unencrypted tunnel issue in the .NET Framework implementation.