CVE-2021-36412Public exploit

Memory corruption via unchecked MPEG payload length

Published Jan 10, 2022 · Updated Aug 4, 2024

Heap-based buffer overflow in GPAC MP4Box 1.0.1 allows context-dependent attackers to corrupt memory via a crafted MPEG video file. During RTP hinting, gp_rtp_builder_do_mpeg12_video reads payload[4] without verifying that certain MPEG picture payloads contain five bytes. Exploitation requires MP4Box to process the file with its hinting operation; the published proof of concept produces an out-of-bounds read and process abort, while broader impact is unspecified.

CVSS severity7.8
High
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

Heap-based buffer overflow in GPAC MP4Box 1.0.1 allows context-dependent attackers to corrupt memory via a crafted MPEG video file. During RTP hinting, gp_rtp_builder_do_mpeg12_video reads payload[4] without verifying that certain MPEG picture payloads contain five bytes. Exploitation requires MP4Box to process the file with its hinting operation; the published proof of concept produces an out-of-bounds read and process abort, while broader impact is unspecified.

The record

CVE
CVE-2021-36412
Published
Jan 10, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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