Druid
CVE-2021-26920
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V4 - API and Web Service External resource reference control
|
| Impact | CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system. |
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Alert meAnalysisAI
In the Druid ingestion system, the InputSource is used for reading data from a certain data source. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in maven, npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified under CWE-610. In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource. Affected products include: Apache Druid.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource.
Blast Radius
ecosystem impact- 63 maven packages depend on org.apache.druid:druid-core (62 direct, 1 indirect)
- 2,010 npm packages depend on fast-xml-parser (696 direct, 1,315 indirect)
Ecosystem-wide dependent count for version 0.21.0 and other introduced versions.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Affected Products (CPE)NVD
Apache Druid includes the ability to execute user-provided JavaScript code embedded in various types of requests. Rated
In the Druid ingestion system, the InputSource is used for reading data from a certain data source. Rated medium severit
Severity: medium (5.8) / important Server-Side Request Forgery (SSRF), Improper Neutralization of Input During Web Page
Authentication bypass in Apache Druid versions 0.17.0 through 35.x. Affects all versions prior to 36.0.0 when specific p
Apache Druid’s Kerberos authenticator uses a weak fallback secret when the `druid.auth.authenticator.kerberos.cookieSign
Apache Druid allows users to read data from other database systems using JDBC. Rated high severity (CVSS 8.8), this vuln
In Druid 1.2.3, visiting the path with parameter in a certain function can lead to directory traversal. Rated high sever
Apache Druid allows users with certain permissions to read data from other database systems using JDBC. Rated medium sev
When LDAP authentication is enabled in Apache Druid 0.17.0, callers of Druid APIs with a valid set of LDAP credentials c
Padding Oracle vulnerability in Apache Druid extension, druid-pac4j. Rated medium severity (CVSS 5.3), this vulnerabilit
In Apache Druid 0.22.1 and earlier, the server did not set appropriate headers to prevent clickjacking. Rated medium sev
GitHub PoC
Exploit-DB