CVE-2020-9492

Improper Privilege Management in Apache Hadoop

8.8 HighFix available

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.49%Down 0.6 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: CVE-2020-9492
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-863
Updated: 2026-11-02

CVE List No score

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: CVE-2020-9492
Updated: 2026-11-02

EUVDEUVD-2022-0976 No score

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: EUVD-2022-0976
Updated: 2026-11-03

GitHub AdvisoriesGHSA-f8vc-wfc8-hxqh 8.8

Improper Privilege Management in Apache Hadoop

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: GHSA-f8vc-wfc8-hxqh
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269, CWE-863
Updated: 2026-11-02

OSV 8.8

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: CVE-2020-9492
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-f8vc-wfc8-hxqh 8.8

Improper Privilege Management in Apache Hadoop

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: GHSA-f8vc-wfc8-hxqh
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-269, CWE-863
Updated: 2026-11-02

OSVOESA-2021-1201 8.8

hadoop security update

Apache Hadoop is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage.

Security Fix(es):

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0-alpha1 to 3.1.3, and 2.0.0-alpha to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.(CVE-2020-9492)

Record: OESA-2021-1201
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVBIT-solr-2020-9492 No score

In Apache Hadoop 3.2.0 to 3.2.1, 3.0.0 to 3.1.3, and 2.0.0 to 2.10.0, WebHDFS client might send SPNEGO authorization header to remote URL without proper verification.

Record: BIT-solr-2020-9492
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.hadoop:hadoop-common` Maven	2.0.0 up to 2.10.1	2.10.1
`org.apache.hadoop:hadoop-common` Maven	3.2.0 up to 3.2.2	3.2.2
`org.apache.hadoop:hadoop-common` Maven	3.0.0 up to 3.1.4	3.1.4
`solr` Bitnami	8.6.0 up to 8.6.1, 8.6.2 up to 8.6.3	8.6.18.6.3
`org.apache.hadoop:hadoop-common` Maven	3.2.0 up to 3.2.2, plus listed versions 3.2.1	3.2.2
`org.apache.hadoop:hadoop-common` Maven	3.0.0 up to 3.1.4, plus listed versions 3.0.13.0.23.0.33.1.03.1.13.1.23.1.3	3.1.4
`org.apache.hadoop:hadoop-common` Maven	2.0.0 up to 2.10.1, plus listed versions 2.0.1-alpha2.0.2-alpha2.0.3-alpha2.0.4-alpha2.0.5-alpha Show 34 moreShow less 2.0.6-alpha2.1.0-beta2.1.1-beta2.10.02.2.02.3.02.4.02.4.12.5.02.5.12.5.22.6.02.6.12.6.22.6.32.6.42.6.52.7.02.7.12.7.22.7.32.7.42.7.52.7.62.7.72.8.02.8.12.8.22.8.32.8.42.8.52.9.02.9.12.9.2	2.10.1
`hadoop` openEuler:20.03-LTS-SP1	before 3.2.1-7.oe1	3.2.1-7.oe1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-9492 is a high vulnerability (CVSS 8.8) in Apache Hadoop, published January 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.49%, the 91st percentile. Fixed in org.apache.hadoop:hadoop-common 2.10.1.

References

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