CVE-2021-31258

Process crash via unchecked sample-entry pointers

Published Apr 19, 2021 · Updated Aug 3, 2024

NULL pointer dereference in GPAC 1.0.1 allows attackers to crash MP4Box when RTP hinting processes a crafted media file. gf_isom_set_extraction_slc dereferences nested esd, desc, and slConfig pointers from MP4 sample entries without first checking whether they are null. Exploitation requires the crafted file to reach the extraction-SL setup path, and the bounded consequence is termination of the MP4Box process.

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 GPAC 1.0.1 allows attackers to crash MP4Box when RTP hinting processes a crafted media file. gf_isom_set_extraction_slc dereferences nested esd, desc, and slConfig pointers from MP4 sample entries without first checking whether they are null. Exploitation requires the crafted file to reach the extraction-SL setup path, and the bounded consequence is termination of the MP4Box process.

The record

CVE
CVE-2021-31258
Published
Apr 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476
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

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NVDCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

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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