CVE-2021-40609Public exploit

Process crash via unchecked hint-header type

Published Jun 28, 2022 · Updated Aug 4, 2024

Heap-buffer overflow in GPAC 1.0.1 allows attackers to crash MP4Box by processing a crafted multimedia file. GetHintFormat casts the track InfoHeader to a hint-media header and reads its fields without first verifying the underlying box type, producing a four-byte out-of-bounds heap read. Exploitation requires MP4Box to process the crafted file and interrupts only that process; no confidentiality or integrity impact is reported.

CVSS severity5.5
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in GPAC 1.0.1 allows attackers to crash MP4Box by processing a crafted multimedia file. GetHintFormat casts the track InfoHeader to a hint-media header and reads its fields without first verifying the underlying box type, producing a four-byte out-of-bounds heap read. Exploitation requires MP4Box to process the crafted file and interrupts only that process; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2021-40609
Published
Jun 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1204.002, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 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 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-770Allocation of Resources Without Limits or Throttling
T1204.002Malicious File
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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