CVE-2021-41561Network attack vector

Service interruption via negative page-header values

Published Dec 20, 2021 · Updated Aug 4, 2024

Improper input validation in Apache Parquet-MR 1.9.0 through 1.11.1 and 1.12.0 through 1.12.1 allows attackers to cause a service interrupt. The page-header reader accepts negative compressed or uncompressed sizes and negative data-page counts, then uses those invalid values during page processing. Exploitation requires a consuming application to read an attacker-supplied Parquet file, and the resulting failure interrupts that application's workload.

CVSS severity7.5
High
EPSS probability3.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Apache Parquet-MR 1.9.0 through 1.11.1 and 1.12.0 through 1.12.1 allows attackers to cause a service interrupt. The page-header reader accepts negative compressed or uncompressed sizes and negative data-page counts, then uses those invalid values during page processing. Exploitation requires a consuming application to read an attacker-supplied Parquet file, and the resulting failure interrupts that application's workload.

The record

CVE
CVE-2021-41561
Published
Dec 20, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Parquet
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.9.0 <Parquet-MR*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Parquetversion=1.9.0 <Parquet-MR*

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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