Remote denial of service via unbounded form parsing
Published Dec 3, 2025 · Updated Sep 4, 2026
Denial of service in Undertow within Red Hat JBoss EAP 7 and 8 allows remote attackers to exhaust memory with large form bodies. FormEncodedDataDefinition.doParse(StreamSourceChannel) accumulates application/x-www-form-urlencoded data without a size limit until JVM heap is exhausted. Exploitation requires an externally reachable servlet or class to invoke this parser without upper-layer size validation, causing the application server to terminate or become unavailable.
Summary
What happened
Denial of service in Undertow within Red Hat JBoss EAP 7 and 8 allows remote attackers to exhaust memory with large form bodies. FormEncodedDataDefinition.doParse(StreamSourceChannel) accumulates application/x-www-form-urlencoded data without a size limit until JVM heap is exhausted. Exploitation requires an externally reachable servlet or class to invoke this parser without upper-layer size validation, causing the application server to terminate or become unavailable.
The record
- CVE
- CVE-2024-3884
- Published
- Dec 3, 2025
- Updated
- Sep 4, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat JBoss Enterprise Application Platform 8
- Classifications
- CWE-20, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 3, 2025CVE publishedPublication date reported by the CVE source.
- Sep 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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