How severe is CVE-2025-21621?

CVE-2025-21621 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-21621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21621?

CVE-2025-21621 affects Geoserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-21621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-21621 have an EU (EUVD) identifier?

Yes. CVE-2025-21621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199607.

When was CVE-2025-21621 published?

CVE-2025-21621 was published on 2025-11-25 and last updated on 2026-06-17.

CVE-2025-21621

CVE-2025-21621 is a medium-severity vulnerability in Geoserver with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199607
Weakness: CWE-79
Affected product: Geoserver
Published: 2025-11-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-21621?: 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.
How severe is CVE-2025-21621?: CVE-2025-21621 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-21621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21621?: CVE-2025-21621 affects Geoserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-21621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-21621 have an EU (EUVD) identifier?: Yes. CVE-2025-21621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199607.
When was CVE-2025-21621 published?: CVE-2025-21621 was published on 2025-11-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:geoserver:geoserver:*:*:*:*:*:*:*:*

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