What is CVE-2021-41561?

CVE-2021-41561 is a high-severity vulnerability in Apache Parquet Java, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-12-20.

How severe is CVE-2021-41561?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Apache Parquet Java

CVE-2021-41561

Improper Input Validation vulnerability in Parquet-MR of Apache Parquet allows an attacker to DoS by malicious Parquet files. This issue affects Apache Parquet-MR version 1.9.0 and later versions.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Apache Parquet Java
Apache Software Foundation Parquet — versions 1.9.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

lists.apache.org/thread/1bjlscbqtfzl160hrm9lnpjpppp5z3zr (Mailing List, Vendor Advisory)
www.openwall.com/lists/oss-security/2021/12/20/1 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-41561?: CVE-2021-41561 is a high-severity vulnerability in Apache Parquet Java, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-12-20.
How severe is CVE-2021-41561?: High severity. CVSS v3 base score is 7.5 out of 10.