CVE-2024-33874Public exploit

Code execution via modification-time metadata encoding overflow

Published May 9, 2024 · Updated Feb 13, 2025

Heap buffer overflow in HDF5 1.14.3 and earlier allows context-dependent attackers to crash or execute code via a crafted HDF5 file. During h5repack processing, H5O__mtime_new_encode writes encoded modification-time metadata beyond its heap output buffer. The target must process attacker-controlled HDF5 content, and the upstream regression test reaches the condition by passing the crafted file to h5repack.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in HDF5 1.14.3 and earlier allows context-dependent attackers to crash or execute code via a crafted HDF5 file. During h5repack processing, H5O__mtime_new_encode writes encoded modification-time metadata beyond its heap output buffer. The target must process attacker-controlled HDF5 content, and the upstream regression test reaches the condition by passing the crafted file to h5repack.

The record

CVE
CVE-2024-33874
Published
May 9, 2024
Updated
Feb 13, 2025
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.14.3* <=1.14.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The HDF Group · HDF5version=1.14.3* <=1.14.3

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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