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CVE-2021-26920

26
FAUCET Score

CVE-2021-26920 affects Apache Druid's ingestion system, specifically the HTTP InputSource. Authenticated users can exploit this to read local files on the Druid server, bypassing application-level restrictions that might otherwise prevent direct local file access. This vulnerability has a CVSS score of 6.5 (Medium), indicating it can be exploited over the network with low complexity by a low-privileged user to achieve high confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

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
9.88%
Probability of exploitation in next 30 days
EPSS Percentile
95.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0988 is in the 99th percentile among its peer group of 21,974 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: 0.21.0

Vendor Advisories (2)

mavenGHSA-793h-6f7r-6qvmmedium

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

Aug 13, 2021
redhatCVE-2021-26920Moderate

druid: HTTP InputSource allows authenticated users to read data from other sources

Jul 2, 2021

References

lists.apache.org / thread.html/r29e45561343cc5cf7d3290ee0b0e94e565faab19c20d022df9b5e29c%40%3Cdev.druid.apache.org%3E
Mailing ListVendor Advisory
lists.apache.org / thread.html/r304dfe56a5dfe1b2d9166b24d2c74ad1c6730338b20aef77a00ed2be%40%3Cannounce.apache.org%3E
lists.apache.org / thread.html/r61aab724cf97d80da7f02d50e9af6de5c7c40dd92dab7518746fbaa2%40%3Cannounce.apache.org%3E
lists.apache.org / thread.html/rc9400a70d0ec5cdb8a3486fc5ddb0b5282961c0b63e764abfbcb9f5d%40%3Cdev.druid.apache.org%3E
openwall.com / lists/oss-security/2021/07/02/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2021/09/24/1
Mailing ListThird Party Advisory