CVE-2021-45764Public exploit

Application crash via invalid chunk-offset dereference

Published Jan 14, 2022 · Updated Aug 4, 2024

Invalid memory dereference in GPAC 1.1.0 allows context-dependent attackers to crash MP4Box by processing a crafted media file. The shift_chunk_offsets function dereferences an invalid address while MP4Box rewrites chunk offsets during the -hint operation on malformed box structures. Exploitation requires a user or workflow to pass the crafted file to MP4Box; the demonstrated consequence is a segmentation fault that terminates the application.

CVSS severity5.5
Medium
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid memory dereference in GPAC 1.1.0 allows context-dependent attackers to crash MP4Box by processing a crafted media file. The shift_chunk_offsets function dereferences an invalid address while MP4Box rewrites chunk offsets during the -hint operation on malformed box structures. Exploitation requires a user or workflow to pass the crafted file to MP4Box; the demonstrated consequence is a segmentation fault that terminates the application.

The record

CVE
CVE-2021-45764
Published
Jan 14, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 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

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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