CVE-2025-27821

Name: CVE-2025-27821
Creator: NVD / NIST
Published: 2026-01-26T10:16:05.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2025-27821 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client. This issue affects Apache Hadoop: from 3.2.0 before 3.4.2. Users are recommended to upgrade to version 3.4.2, which fixes the issue.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client. This issue affects Apache Hadoop: from 3.2.0 before 3.4.2. Users are recommended to upgrade to version 3.4.2, which fixes the issue.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

0.86%

53.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Apache	Hadoop	>= 3.2.0, < 3.4.2

References

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplhMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/01/23/7Mailing List, Third Party Advisory

Timeline

Published: Jan 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-27821?

How severe is CVE-2025-27821?

CVE-2025-27821 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2025-27821?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-27821?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST