Cyber Resilience

CVE-2024-7765

H2O 3.46.0.2

Public PoC
Published
20 March 2025
Modified
01 April 2025
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0072 51th percentile
Risk Priority 59 floored blend · peak EPSS

Summary

CVE-2024-7765 is a high-severity Data Amplification (CWE-409) vulnerability in H2O H2O. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked in the top 49% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

This vulnerability is AI-related — categorised as Machine Learning Libraries; in the Data-Related Vulnerabilities risk domain.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and SC-5 (Denial-of-service Protection) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2024-7765 affects h2oai/h2o-3 version 3.46.0.2 and involves a denial-of-service vulnerability triggered by uploading and repeatedly parsing a large GZIP file. This improper handling of highly compressed data causes significant data amplification, leading to memory exhaustion and a surge in concurrent slow-running jobs that render the server unresponsive. The issue is classified under CWE-409 with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Unauthenticated remote attackers can exploit this vulnerability with low complexity over the network. By supplying a malicious large GZIP file for repeated parsing, they trigger excessive resource consumption, resulting in denial of service through server unresponsiveness.

Mitigation details are available in the referenced advisory at https://huntr.com/bounties/0e58b1a5-bdca-4e60-af92-09de9c76a9ff.

EU & UK References

Vulnerability Data

In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue…

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arises from the improper handling of highly compressed data, leading to significant data amplification.

CWE(s)
CWE-409

AI Security AnalysisAI

AI Category
Machine Learning Libraries
Risk Domain
Data-Related Vulnerabilities
OWASP Top 10 for LLMs 2025
None mapped
Classification Reason
Matched keywords: h2o

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-10549Same product: H2O H2O
CVE-2024-10550Same product: H2O H2O
CVE-2024-8062Same product: H2O H2O
CVE-2024-7768Same product: H2O H2O
CVE-2024-6863Same product: H2O H2O
CVE-2026-8751Same product: H2O H2O
CVE-2026-8750Same product: H2O H2O
CVE-2024-8616Same product: H2O H2O
CVE-2025-10768Same product: H2O H2O
CVE-2024-6854Same product: H2O H2O

Affected Assets

h2o
h2o
3.46.0.2

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation can reject or limit decompression of data whose expansion ratio exceeds safe thresholds.

SC-5 Denial-of-service Protection partial match

DoS protection limits the resource-exhaustion impact when a decompression bomb is processed.

SC-6 Resource Availability partial match

Resource allocation controls bound memory/CPU consumption that a data-amplification attack would otherwise exhaust.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure-development practices include input-validation and resource-limit checks that prevent improper handling of compressed data.

DE.CM-09 partial match
prevents

Runtime monitoring of compute resources can detect exhaustion caused by decompression bombs.

PR.IR-04 partial match
prevents

Capacity planning and monitoring directly limits the availability impact of data-amplification attacks.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can uncover decompression-bomb vulnerabilities before release.

A.8.14 Redundancy of information processing facilities partial match
mitigates

Redundancy helps availability but does not address the root cause of the weakness.

A.8.16 Monitoring activities partial match
finds

Monitoring can detect anomalous resource usage but does not prevent the weakness.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes input validation and resource-limit checks that mitigate data-amplification attacks.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate limits on decompression size and ratio.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage defensive design against resource-exhaustion threats.

References