A moderate-severity vulnerability within the Hadoop Distributed File System (HDFS) native consumer might enable attackers to set off system crashes or corrupt vital information by way of maliciously crafted URI inputs.
The vulnerability, tracked as CVE-2025-27821, impacts Apache Hadoop variations 3.2.0 by way of 3.4.1. Stems from an out-of-bounds write flaw within the URI parser of the HDFS native consumer.
This safety weak point permits attackers to put in writing information past allotted reminiscence boundaries, doubtlessly resulting in utility crashes, denial-of-service (DoS) assaults, or information corruption.
Technical Influence
The out-of-bounds write vulnerability happens when the native HDFS consumer processes specifically crafted Uniform Useful resource Identifiers (URIs).
CVE IDSeverityAffected VersionsComponentCVE-2025-27821Moderate3.2.0 – 3.4.1HDFS Native Consumer
By exploiting improper bounds checking within the URI parsing logic, attackers may cause the appliance to put in writing information to unintended reminiscence areas.
This kind of reminiscence corruption vulnerability can lead to unpredictable system habits, together with service disruptions and potential information integrity points.
Organizations utilizing HDFS native shoppers for distributed storage operations face explicit danger, as compromised file system operations might have an effect on information reliability throughout clustered environments.
The vulnerability was found and reported by safety researcher BUI Ngoc Tan, who obtained credit score for accountable disclosure.
Affected Programs and Mitigation
The vulnerability impacts all Apache Hadoop deployments working variations 3.2.0 by way of 3.4.1 that make the most of the hadoop-hdfs-native-client element.
Apache has categorized this as a moderate-severity situation, internally tracked as HDFS-17754. Apache has launched Hadoop model 3.4.2 with patches that handle the URI parsing flaw.
Organizations are strongly really helpful to improve to model 3.4.2 instantly to eradicate the vulnerability.
System directors ought to prioritize patching HDFS native consumer installations, significantly in manufacturing environments that deal with delicate information or run mission-critical workloads.
In response to SecLists advisory, for organizations unable to patch instantly, implement network-level controls to limit URI inputs.
Monitoring HDFS consumer logs for uncommon parsing errors or crashes can briefly cut back danger till the improve is accomplished.
The disclosure follows Apache’s commonplace vulnerability coordination procedures, with full technical particulars obtainable by way of the official Apache Hadoop safety advisory and CVE database.
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