CVE-2021-40562

MP4Box crash via floating-point exception

Published Jan 12, 2022 · Updated Aug 4, 2024

Denial of service in GPAC MP4Box through 1.0.1 allows attackers to interrupt processing via a crafted media file. The naludmx_enqueue_or_dispatch function in reframe_nalu.c performs an invalid floating-point operation while parsing NAL units, triggering a segmentation fault. Exploitation requires a local user to open or process the malicious file, and the reported consequence is an application-level service interruption.

CVSS severity5.5
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GPAC MP4Box through 1.0.1 allows attackers to interrupt processing via a crafted media file. The naludmx_enqueue_or_dispatch function in reframe_nalu.c performs an invalid floating-point operation while parsing NAL units, triggering a segmentation fault. Exploitation requires a local user to open or process the malicious file, and the reported consequence is an application-level service interruption.

The record

CVE
CVE-2021-40562
Published
Jan 12, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-697, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 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

5.5NVDCVSS: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-697Numeric Errors
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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