CVE-2025-0556
Progress Telerik Report Server ≤ 11.0.25.211
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSummary
CVE-2025-0556 is a high-severity Cleartext Transmission of Sensitive Information (CWE-319) vulnerability in Progress Telerik Report Server. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 22th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SC-8 (Transmission Confidentiality and Integrity) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
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.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-1753
Vulnerability Data
In Progress® Telerik® Report Server, versions prior to 2025 Q1 (11.0.25.211) when using the older .NET Framework implementation, communication of non-sensitive information between the service agent process and app host process occurs over an unencrypted tunnel, which can be subjected…
more
to local network traffic sniffing.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SC-8 directly requires protecting confidentiality of transmitted information, which structurally eliminates cleartext transmission of sensitive data.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Encryption of data-in-transit directly prevents cleartext transmission while the control also addresses integrity and availability.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Specifying encryption and other security technology for network services prevents transmission of sensitive information in cleartext over potentially untrusted channels.
Mandating cryptographic protection and stronger authentication on public networks stops the transmission of plaintext sensitive information.
Specifying communications-security requirements and secure remote-access methods (including encryption expectations) prevents the transmission of sensitive data in cleartext over home or public networks.
Armoured conduits, electromagnetic shielding and locked enclosures make passive eavesdropping on unencrypted traffic traversing the cables more difficult, mitigating exposure of sensitive data in transit.