Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-31522

31
FAUCET Score

CVE-2021-31522 is a critical vulnerability in Apache Kylin versions 2.6.6 and prior, 3.1.2 and prior, and 4.0.0 and prior, allowing attackers to load arbitrary classes via user input due to improper input validation. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity, leading to complete compromise of confidentiality, integrity, and availability. While no public exploits or active exploitation have been observed, and community discussion is minimal, the high FAUCET Risk Score of 83/100 indicates its significant potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, <= 2.6.6CPE matchmatch criteria
cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
>= 3.0.0, < 3.1.3CPE matchmatch criteria
cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:apache:kylin:4.0.0:-:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:apache:kylin:4.0.0:alpha:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:apache:kylin:4.0.0:beta:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.90%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0290 is in the 76th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.apache.kylin:kylinFixed in: 3.1.3
mavenpatch availablevia ghsa
Product: org.apache.kylin:kylinFixed in: 4.0.1

Vendor Advisories (1)

mavenGHSA-q656-g2x3-8cghmedium

Kylin can receive user input and load any class through Class.forName(...).

Jan 8, 2022

References

lists.apache.org / thread/hh5crx3yr701zd8wtpqo1mww2rlkvznw
PatchVendor Advisory
openwall.com / lists/oss-security/2022/01/06/4
Mailing ListPatchThird Party Advisory