CVE-2021-32437Public exploit

Process crash via unchecked sample pointer

Published Aug 11, 2021 · Updated Aug 3, 2024

NULL pointer dereference in GPAC 1.0.1 allows attackers to crash MP4Box by processing a crafted file with the hinting command. The gf_hinter_finalize function dereferences the sample returned by gf_isom_get_sample without checking whether the pointer is NULL before reading its data and length. Exploitation requires a crafted file to be supplied to MP4Box's hinting operation; the demonstrated consequence is a crash of that process.

CVSS severity5.5
Medium
EPSS probability0.75%
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 GPAC 1.0.1 allows attackers to crash MP4Box by processing a crafted file with the hinting command. The gf_hinter_finalize function dereferences the sample returned by gf_isom_get_sample without checking whether the pointer is NULL before reading its data and length. Exploitation requires a crafted file to be supplied to MP4Box's hinting operation; the demonstrated consequence is a crash of that process.

The record

CVE
CVE-2021-32437
Published
Aug 11, 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. Aug 11, 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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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