CVE-2021-25646Public exploitNetwork attack vector

Authenticated code execution via empty-key configuration injection

Published Jan 29, 2021 · Updated Feb 13, 2025

Code injection in Apache Druid 0.20.0 and earlier allows remote authenticated users to execute code through crafted JSON requests. Jackson binds an attacker-controlled empty JSON key to JavaScriptConfig, enabling JavaScriptDimFilter to run its supplied function despite the server setting. Access to an authenticated Druid request interface is required, and execution occurs with the privileges of the Druid server process.

CVSS severity8.8
High
EPSS probability99.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Apache Druid 0.20.0 and earlier allows remote authenticated users to execute code through crafted JSON requests. Jackson binds an attacker-controlled empty JSON key to JavaScriptConfig, enabling JavaScriptDimFilter to run its supplied function despite the server setting. Access to an authenticated Druid request interface is required, and execution occurs with the privileges of the Druid server process.

The record

CVE
CVE-2021-25646
Published
Jan 29, 2021
Updated
Feb 13, 2025
Vendor
The Apache Software Foundation
Product
Apache Druid
Classifications
CWE-732, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.20.0 and earlier <=0.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Druidversion=0.20.0 and earlier <=0.20.0

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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