CVE-2021-31259

Process crash via unchecked sample-group entry dereference

Published Apr 19, 2021 · Updated Aug 3, 2024

NULL pointer dereference in GPAC MP4Box 1.0.1 allows attackers to crash the process by supplying a crafted media file. The gf_isom_cenc_get_default_info_internal function retrieves a null sample-group entry with gf_list_get and dereferences its key_info member without checking the returned pointer. Processing an attacker-supplied file through MP4Box is required, and the demonstrated consequence is termination of that process.

CVSS severity5.5
Medium
EPSS probability0.90%
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 MP4Box 1.0.1 allows attackers to crash the process by supplying a crafted media file. The gf_isom_cenc_get_default_info_internal function retrieves a null sample-group entry with gf_list_get and dereferences its key_info member without checking the returned pointer. Processing an attacker-supplied file through MP4Box is required, and the demonstrated consequence is termination of that process.

The record

CVE
CVE-2021-31259
Published
Apr 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 19, 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

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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