CVE-2025-10630 is a vulnerability identified in the Grafana-Zabbix plugin, a widely used extension for the Grafana open-source monitoring platform. This plugin integrates Zabbix monitoring data into Grafana dashboards, enabling real-time visualization and analysis of metrics. The vulnerability is classified under CWE-20, indicating improper input validation. Specifically, versions 5.2.1 and earlier of the grafana-zabbix-plugin are susceptible to a Regular Expression Denial of Service (ReDoS) attack. This occurs when an attacker supplies a crafted regex query that causes the plugin's regex engine to consume excessive CPU resources, leading to a denial of service by maxing out CPU usage. The flaw does not impact confidentiality or integrity but affects availability by potentially rendering the monitoring dashboards unresponsive or significantly degraded. The vulnerability requires network access and low privileges (PR:L), but no user interaction is necessary, making it relatively straightforward to exploit remotely. The issue was addressed in version 6.0.0 of the plugin, which includes proper input validation to mitigate the ReDoS risk. No known exploits are currently reported in the wild, but the presence of this vulnerability in monitoring infrastructure components poses a risk to operational continuity if left unpatched. The CVSS v3.1 base score is 4.3 (medium severity), reflecting the limited impact scope and moderate exploit complexity.

For European organizations, the impact of this vulnerability primarily concerns the availability of monitoring and observability systems that rely on the Grafana-Zabbix plugin. Disruption of monitoring dashboards can delay detection of critical incidents, degrade operational visibility, and impair incident response capabilities. Organizations in sectors with high reliance on real-time monitoring—such as finance, telecommunications, energy, and critical infrastructure—may experience operational risks if their monitoring systems become unresponsive. While the vulnerability does not directly compromise data confidentiality or integrity, the denial of service could indirectly affect service levels and compliance with regulatory requirements for system availability and incident management. Given the widespread adoption of Grafana and Zabbix in Europe, especially among enterprises and managed service providers, the vulnerability poses a tangible risk to business continuity and service reliability if exploited.

European organizations should prioritize upgrading the grafana-zabbix-plugin to version 6.0.0 or later, where the vulnerability is fixed. Until the upgrade is applied, organizations can implement input validation controls at the application or network level to restrict or sanitize user-supplied regex queries, preventing malicious patterns from reaching the plugin. Monitoring CPU usage on Grafana servers and setting alerts for abnormal spikes can help detect exploitation attempts early. Additionally, restricting access to the Grafana dashboard and plugin interfaces using network segmentation, VPNs, or strong authentication mechanisms can reduce the attack surface. Organizations should also review and limit user privileges to minimize the potential for low-privilege users to submit harmful regex queries. Regular vulnerability scanning and patch management processes should be enforced to ensure timely detection and remediation of such vulnerabilities in monitoring infrastructure components.