CVE-2025-21621
6.1 · MEDIUMOverview
CVE-2025-21621 is a medium-severity vulnerability affecting geoserver geoserver. It was published on November 25, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
GeoServer is an open source server that allows users to share and edit geospatial data. Prior to version 2.25.0, a reflected cross-site scripting (XSS) vulnerability exists in the WMS GetFeatureInfo HTML output format that enables a remote attacker to execute arbitrary JavaScript code in a victim's browser through specially crafted SLD_BODY parameters. This issue has been patched in version 2.25.0.
Remediation
Check the references section for vendor advisories and patches from geoserver. Update geoserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| geoserver | geoserver | >= 0, < 2.25.0 | Affected |
Frequently Asked Questions
What is CVE-2025-21621?
CVE-2025-21621 is a medium-severity vulnerability affecting geoserver geoserver. It was published on November 25, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2025-21621?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-21621?
Check the references section for vendor advisories and patches from geoserver. Update geoserver to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-21621?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-21621 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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