CVE-2021-46236Public exploit

Process crash via null MFDouble field dereference

Published Jan 21, 2022 · Updated Aug 4, 2024

A NULL pointer dereference in GPAC 1.1.0 allows local users to crash MP4Box by processing a crafted SVG scene file. During MP4Box's -svg conversion, gf_sg_vrml_field_pointer_del dereferences a null MFDouble field without first checking it. The crash requires a user to direct MP4Box to parse the crafted file; the demonstrated consequence is a segmentation fault that interrupts that process.

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

A NULL pointer dereference in GPAC 1.1.0 allows local users to crash MP4Box by processing a crafted SVG scene file. During MP4Box's -svg conversion, gf_sg_vrml_field_pointer_del dereferences a null MFDouble field without first checking it. The crash requires a user to direct MP4Box to parse the crafted file; the demonstrated consequence is a segmentation fault that interrupts that process.

The record

CVE
CVE-2021-46236
Published
Jan 21, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 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

5.5UbuntuCVSS: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
T1499.004Application or System Exploitation

Public exploit references

  • POC2.zipproof of concept · demonstrated

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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