Is CVE-2025-21621 actively exploited?

CVE-2025-21621 has no public evidence of in-the-wild exploitation as of 2025-12-03.

What is the CVSS score for CVE-2025-21621?

CVE-2025-21621 has a CVSS score of 6.1 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

How do I patch CVE-2025-21621?

Patch guidance is available from geoserver security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-21621.

Which products are affected by CVE-2025-21621?

1 product: geoserver geoserver.

CVE-2025-21621 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: changed
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: GEOSERVER
Published: 11/25/2025
Last Modified: 12/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2025-21621

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary