CVE-2021-45830Public exploit

Application crash via truncated file-space message decoding

Published Jan 5, 2022 · Updated Aug 4, 2024

Heap-based buffer overflow in HDF5 1.13.1-1 allows context-dependent attackers to crash an application by supplying a malformed HDF5 file. The H5O__fsinfo_decode path decodes fields from a truncated file-space information message without confirming that each value remains inside the message buffer, causing H5F_addr_decode_len to read past the heap allocation. An application must process the crafted file; the demonstrated result is a segmentation fault that interrupts that process, with no reported data disclosure or code execution.

CVSS severity5.5
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in HDF5 1.13.1-1 allows context-dependent attackers to crash an application by supplying a malformed HDF5 file. The H5O__fsinfo_decode path decodes fields from a truncated file-space information message without confirming that each value remains inside the message buffer, causing H5F_addr_decode_len to read past the heap allocation. An application must process the crafted file; the demonstrated result is a segmentation fault that interrupts that process, with no reported data disclosure or code execution.

The record

CVE
CVE-2021-45830
Published
Jan 5, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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-787Out-of-bounds Write

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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