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CVE-2021-36749

76
FAUCET Score

CVE-2021-36749 describes a local file inclusion vulnerability in Apache Druid's ingestion system, specifically within the HTTP InputSource. Authenticated users can exploit this to read local files on the Druid server with the server process's privileges, bypassing application-level restrictions. This medium-severity vulnerability (CVSS 6.5) has a low attack complexity and can lead to high confidentiality impact, though it does not affect integrity or availability. While there is no evidence of active exploitation or Metasploit modules, Nuclei templates exist for detection, and its high EPSS score indicates a significant likelihood of future exploitation. Community discussion and media coverage are currently minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.22.0CPE matchmatch criteria
cpe:2.3:a:apache:druid:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
81.04%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2021-36749 · Oct 25, 2021
This CVE's current EPSS score of 0.8104 is in the 100th percentile among its peer group of 21,951 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.druid:druid-coreFixed in: 0.22.0

Vendor Advisories (2)

mavenGHSA-9p5g-vg43-mj5rmedium

Druid ingestion system Authenticated users can read data from other sources than intended

Sep 27, 2021
redhatCVE-2021-36749Moderate

druid: HTTP InputSource allows authenticated users to read data from other sources (incomplete fix of CVE-2021-26920)

Sep 23, 2021

References

lists.apache.org / thread.html/r304dfe56a5dfe1b2d9166b24d2c74ad1c6730338b20aef77a00ed2be%40%3Cannounce.apache.org%3E
lists.apache.org / thread.html/rc9400a70d0ec5cdb8a3486fc5ddb0b5282961c0b63e764abfbcb9f5d%40%3Cdev.druid.apache.org%3E
Mailing ListVendor Advisory