No exploitation reportedFix available

CVE-2021-37404

Q: Is CVE-2021-37404 actively exploited?

Active exploitation of CVE-2021-37404 has not been confirmed. Its EPSS score was 3.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-37404?

CVE-2021-37404 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.

Published2022-06-13
Fixed in3.3.2 · 3.2.3 · 2.10.2
WeaknessCWE-787

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

There is a potential heap buffer overflow in Apache Hadoop libhdfs native code. Opening a file path provided by user without validation may result in a denial of service or arbitrary code execution. Users should upgrade to Apache Hadoop 2.10.2, 3.2.3, 3.3.2 or higher.

Timeline

dates in UTC

2022-06-1307:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2021-37404?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-37404?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apache hadoop

Branch	Affected	Fixed in	Source
3.3	≥ 3.3.0, < 3.3.2	3.3.2	NVD · OSV
3.2	≥ 3.2.0, < 3.2.3	3.2.3	NVD
3.x	≥ 3.0.0, < 3.2.3	3.2.3	OSV
2.x	≥ 2.9.0, < 2.10.2	2.10.2	NVD
2.10	< 2.10.2	2.10.2	OSV
3.x	≥ 3.0.0, ≤ 3.1.4	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 hadoop to 3.3.2 · 3.2.3 · 2.10.2

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
CNAweakness (CWE)CWE-787read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score3.0 %2026-10-23
OSVaffected packages—

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: 2022-06-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-37404?

Is CVE-2021-37404 actively exploited?

Active exploitation of CVE-2021-37404 has not been confirmed. Its EPSS score was 3.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-37404?

CVE-2021-37404 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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