No exploitation reportedFix available

CVE-2021-31522

Q: Is CVE-2021-31522 actively exploited?

Active exploitation of CVE-2021-31522 has not been confirmed. Its EPSS score was 2.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-31522?

CVE-2021-31522 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2022-01-06
Fixed in3.1.3
WeaknessCWE-470

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2022-01-0613:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-31522?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-31522?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Apache kylin

Branch	Affected	Fixed in	Source
3.x	≥ 3.0.0, < 3.1.3	3.1.3	NVD
2.x	≥ 2.0.0, ≤ 2.6.6	no fix published	NVD
4.0	= 4.0.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Apache kylin to 3.1.3

Advisories and patches

www.openwall.comPatch
lists.apache.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-470read 2026-10-23
FIRST EPSSEPSS score2.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2022-01-06
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-31522?

Is CVE-2021-31522 actively exploited?

Active exploitation of CVE-2021-31522 has not been confirmed. Its EPSS score was 2.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31522?

CVE-2021-31522 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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