CVE-2021-36749: vulnerability in Apache Druid
Apache Druid: The HTTP inputSource allows authenticated users to read data from other sources than intended (incomplete fix of CVE-2021-26920)
Published · Updated
82Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actepss 81%
from disclosure to weapon0 days
Published on NVDSep 24
1st PoCMay 22
VulnCheck+177d
exploitation probability
81%top 1% of all CVEs
observed exploitation
yesVulnCheck
3 public exploit(s)
What the vendors declare (VEX)
Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.
Red HatVEX document ↗
Not affected
1 product — because the vulnerable code is not present in the product
Red Hat OpenShift Container Platform 4
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. This issue was previously mentioned as being fixed in 0.21.0 as per CVE-2021-26920 but was not fixed in 0.21.0 or 0.21.1.
Affected products
Apache Software Foundation · Apache Druidpublic PoCs found — 3
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Related CVEs — Apache Druid
In the same product, most dangerous first.
CVE-2021-25646—Authenticated users can override system configurations in their requests which allows them to execute arbitrary code.EPSS 99.0%CVE-2021-26919—Apache Druid Authenticated users can execute arbitrary code from malicious MySQL database systems.EPSS 22.8%CVE-2021-26920—Apache Druid: The HTTP inputSource allows authenticated users to read data from other sources than intendedEPSS 9.5%CVE-2021-44791—Reflected XSS on certain HTTP endpointsEPSS 2.2%CVE-2022-28889—Clickjacking in the web consoleEPSS 1.9%CVE-2025-27888MEDIUMApache Druid: Server-Side Request Forgery and Cross-Site ScriptingEPSS 1.8%