CVE-2025-27821 — HIGH (7.3)

Q: How severe is CVE-2025-27821?

CVE-2025-27821 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2025-27821?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Hadoop.

Vulnerability 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.

CVSS Score

7.3

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Affected Products

Vendor	Product	Versions
Apache	Hadoop	>= 3.2.0, < 3.4.2

Related Weaknesses (CWE)

CWE-787

References

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplhMailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/01/23/7Mailing ListThird Party Advisory

FAQ

What is CVE-2025-27821?

CVE-2025-27821 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 i...

How severe is CVE-2025-27821?

CVE-2025-27821 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-27821?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Hadoop.