CVE-2025-0556

High

Published: 12 February 2025

Published

12 February 2025

Modified

20 February 2025

KEV Added

—

Patch

—

CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score 0.0015 34.8th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

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 34.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SC-13 (Cryptographic Protection) and SC-8 (Transmission Confidentiality and Integrity).

Threat & Defense at a Glance

What attackers do: exploitation maps to Network Sniffing (T1040). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SC-8 Transmission Confidentiality and Integrity good match

prevent

Requires protection of the confidentiality and integrity of transmitted information, directly mitigating the unencrypted tunnel vulnerable to local network sniffing.

SC-13 Cryptographic Protection good match

prevent

Mandates cryptographic mechanisms to protect communications, addressing the cleartext transmission of information between processes.

SI-2 Flaw Remediation good match

prevent

Directly requires timely remediation of the identified flaw via vendor upgrade that encrypts the inter-process tunnel.

MITRE ATT&CK Enterprise TechniquesAI

T1040 Network Sniffing Credential Access

Adversaries may passively sniff network traffic to capture information about an environment, including authentication material passed over the network.

attack.mitre.org →

Why these techniques?

Vulnerability exposes inter-process traffic in cleartext on local network, directly enabling passive network sniffing (T1040) by an attacker with local network access.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

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…

to local network traffic sniffing.

Deeper analysisAI

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.