CVE-2021-32134Public exploit

Process crash via unchecked sample-entry type dispatch

Published Sep 13, 2021 · Updated Aug 3, 2024

NULL pointer dereference in MP4Box in GPAC 1.0.1 allows attackers to crash the process via a crafted multimedia file. Media_GetESD trusts the file-declared sample-entry type and casts the entry without checking internal_type, allowing gf_odf_desc_copy to receive and dereference a null descriptor. Exploitation requires a user to make MP4Box process the file; the demonstrated consequence is a process crash, not data disclosure or code execution.

CVSS severity5.5
Medium
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in MP4Box in GPAC 1.0.1 allows attackers to crash the process via a crafted multimedia file. Media_GetESD trusts the file-declared sample-entry type and casts the entry without checking internal_type, allowing gf_odf_desc_copy to receive and dereference a null descriptor. Exploitation requires a user to make MP4Box process the file; the demonstrated consequence is a process crash, not data disclosure or code execution.

The record

CVE
CVE-2021-32134
Published
Sep 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-476NULL Pointer Dereference
T1204.002Malicious File

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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