Service interruption via unbounded learning-push cache
Published Jul 8, 2024 · Updated Sep 8, 2026
Memory exhaustion in Undertow 2.3.14.Final and earlier allows remote attackers to interrupt HTTP service through normal requests. LearningPushHandler retains learned push entries without an effective lifetime when maxAge remains at its -1 default; the fix replaces its unbounded storage with an LRU cache. Exposure requires the disabled-by-default learning-push handler to be enabled without overriding maxAge, and sustained requests can exhaust server memory.
Summary
What happened
Memory exhaustion in Undertow 2.3.14.Final and earlier allows remote attackers to interrupt HTTP service through normal requests. LearningPushHandler retains learned push entries without an effective lifetime when maxAge remains at its -1 default; the fix replaces its unbounded storage with an LRU cache. Exposure requires the disabled-by-default learning-push handler to be enabled without overriding maxAge, and sustained requests can exhaust server memory.
The record
- CVE
- CVE-2024-3653
- Published
- Jul 8, 2024
- Updated
- Sep 8, 2026
- Vendor
- Red Hat
- Product
- Red Hat build of Apache Camel for Spring Boot 4
- Classifications
- CWE-401, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2024CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
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?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo