How severe is CVE-2021-41561?

CVE-2021-41561 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-41561 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41561?

CVE-2021-41561 affects Apache Parquet Java. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-41561?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-41561 published?

CVE-2021-41561 was published on 2021-12-20 and last updated on 2026-06-17.

CVE-2021-41561

CVE-2021-41561 is a high-severity vulnerability in Apache Parquet Java with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Apache Parquet Java
Published: 2021-12-20
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-41561?: CVE-2021-41561 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-41561 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41561?: CVE-2021-41561 affects Apache Parquet Java. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-41561?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-41561 published?: CVE-2021-41561 was published on 2021-12-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:parquet_java:*:*:*:*:*:*:*:*

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