CVE-2025-27511: GeoServer DB2 JNDI Injection Remote Code Execution

Technical summary

CVE-2025-27511 is a JNDI injection vulnerability in GeoServer's DB2 DataStore Extension (pre-2.27.0) that stems from improper sanitization of DB2 JDBC connection URLs. The vulnerability maps to CWE-502 (Deserialization of Untrusted Data) and CWE-74 (Improper Neutralization of Special Elements in Output). When an authenticated administrator configures or modifies a DB2 datasource connection, a crafted URL can trigger unsafe JNDI operations, leading to arbitrary code execution in the GeoServer process context. The attack requires valid administrative privileges to access the datastores configuration interface.

Business impact

Exploitation could allow a malicious insider or attacker who has compromised admin credentials to gain full control over the GeoServer instance and underlying system. This enables data theft of sensitive geospatial datasets, lateral movement within the network, installation of persistent backdoors, and potential disruption of geospatial services. Organizations relying on GeoServer for critical infrastructure (utilities, transportation, emergency services) face particularly high operational risk.

Affected systems

GeoServer versions prior to 2.27.0 with the DB2 DataStore Extension installed are vulnerable. The DB2 extension may not be active in all deployments—verify your GeoServer installation by checking the extensions list in the admin console or reviewing deployed plugins. Affected versions span the entire range before 2.27.0; consult the GeoServer release notes to determine which versions in your environment require patching.

Exploitability

The vulnerability requires high-privilege access (GeoServer administrator role) to exploit, significantly limiting its attack surface. An attacker must already possess or have compromised valid admin credentials to reach the datastores configuration panel. However, the attack itself is straightforward once access is obtained—simply configuring a malicious DB2 connection string can trigger RCE. The CVSS score of 7.2 (HIGH) reflects the high privileges required but severe impact if achieved. This is not remotely exploitable by unauthenticated users.

Remediation

Upgrade GeoServer to version 2.27.0 or later. If immediate patching is not feasible, restrict administrative access strictly to trusted personnel, disable the DB2 DataStore Extension if not in use, and monitor datasource configuration changes in GeoServer logs. Organizations should verify the extension's necessity in their deployment before upgrade.

Patch guidance

Apply GeoServer version 2.27.0 or any subsequent release. Verify the patch by checking the version string in GeoServer's administration interface (Administration > About) and confirming the DB2 extension version if it is installed. Test datasource connections after patching to ensure DB2 connectivity functions normally. If you maintain a custom GeoServer build, backport the JNDI injection fix from the official 2.27.0 release.

Detection guidance

Monitor GeoServer logs for configuration changes to DB2 datastores, particularly unusual JDBC URL entries containing JNDI references (ldap://, rmi://, or dns:// schemes). Alert on new datastores created with suspicious connection strings. Audit access to the Datastores administrative panel via GeoServer's access logs. Network-based detection is difficult since the attack occurs within the administrative interface; focus on log-based and access control monitoring.

Why prioritize this

Although the vulnerability requires administrator privileges to trigger, the impact is severe (remote code execution with full system access). Organizations should prioritize this as a medium-to-high priority remediation for any GeoServer instance with the DB2 extension enabled and multiple administrative users. The ease of exploitation once credentials are compromised and the sensitive nature of geospatial data make timely patching important, particularly in critical infrastructure sectors.

Risk score, explained

The CVSS 7.2 score reflects HIGH severity due to the complete confidentiality, integrity, and availability impact (C:H, I:H, A:H) and network-accessible vector. However, the requirement for high privilege (PR:H) and no user interaction prevents a CRITICAL rating. Organizations should weight this internally based on: (1) whether DB2 datastores are actually in use, (2) the number of admin accounts and their security posture, and (3) the sensitivity of hosted geospatial data.

Frequently asked questions