7.3

CVE-2025-27821: apache software foundation hdfs native client Out-of-bounds Write

CVSS: 7.3v3.1HighAnalyzed
AliasesCGA-6rpr-mvwf-fcp8CGA-c5q3-hj74-8698CGA-f69f-h3gj-vqmm
Published 26-01-2026Last modified 26-01-2026
Open JSON

Vulnerability summary

CVE-2025-27821 is a high (CVSS 7.3) Out-of-bounds Write vulnerability in apache software foundation hdfs native client. EPSS estimates a 0.96% chance of exploitation in the next 30 days, higher than 61% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.96%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-01-2026
    PublishedVulnerability first disclosed.
  2. 26-01-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.96%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

+0.09 pp

From 0.88% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.96%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
Apache software foundation1 product
Chainguard1 product
  • hadoop-fips-3.3.6All versions (No fix recorded)
Org.apache.hadoop1 product
  • hadoop-hdfs-native-client≥ 3.2.0, < 3.4.2

4 vendors · 4 products

References

9 links