CVE-2025-21621: GeoServer is an open source server that allows users to share and edit geospatial data

Q: How do I fix CVE-2025-21621?

geoserver: upgrade to 2.25.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-21621 being exploited?

CVE-2025-21621 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-21621 affect?

CVE-2025-21621 affects geoserver. Severity is medium (CVSS 6.1). 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

Q: How urgent is CVE-2025-21621?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2025-21621 is a medium-severity flaw (CVSS 6.1) affecting geoserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-25
Last modified	2026-10-18

Publisher (CNA): GitHub, Inc. · Vendor: geoserver

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-25 22:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

geoserver geoserver UPGRADE

Affected: < 2.25.0

Fixed in: 2.25.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy geoserver || rpm -q geoserver || geoserver --version

2. UPGRADE to 2.25.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade geoserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade geoserver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-21621?

geoserver: upgrade to 2.25.0. Exact commands for each OS are on this page.

Is CVE-2025-21621 being exploited?

CVE-2025-21621 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-21621 affect?

CVE-2025-21621 affects geoserver. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2025-21621?

Priority 27/100. No elevated risk signals yet.

Related CVEs

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CVE-2025-52465 HIGH 7.2 UPGRADE GeoServer is an open source server that allows users to share and edit geospatial data
CVE-2025-58175 MEDIUM 6.5 UPGRADE GeoServer is an open source server that allows users to share and edit geospatial data
CVE-2025-30220 CRITICAL 9.9 UPGRADE UPGRADE GeoServer is an open source server that allows users to share and edit geospatial data

References

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