CVE-2021-31522

Name: CVE-2021-31522
Creator: NVD / NIST
Published: 2022-01-06T13:15:08.027+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.90%

Last modified Jun 17, 2026

CVE-2021-31522 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.. EPSS estimates a 2.90% chance of exploitation in the next 30 days.

Description

Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.90%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-470

Affected Software

Vendor	Product	Versions
Apache	Kylin	>= 2.0.0, <= 2.6.6
Apache	Kylin	>= 3.0.0, < 3.1.3
Apache	Kylin	4.0.0

References

http://www.openwall.com/lists/oss-security/2022/01/06/4Mailing List, Patch, Third Party Advisory
https://lists.apache.org/thread/hh5crx3yr701zd8wtpqo1mww2rlkvznwPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2022/01/06/4Mailing List, Patch, Third Party Advisory
https://lists.apache.org/thread/hh5crx3yr701zd8wtpqo1mww2rlkvznwPatch, Vendor Advisory

Timeline

Published: Jan 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31522?

How severe is CVE-2021-31522?

CVE-2021-31522 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31522?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31522?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST