CVE-2021-36417Public exploit

Arbitrary code execution via unchecked description index

Published Jan 12, 2022 · Updated Aug 4, 2024

Heap-based buffer overflow in MP4Box in GPAC 1.0.1 allows attackers to execute arbitrary code via a crafted MP4 file. gf_isom_dovi_config_get uses DescriptionIndex minus one to access the sample-description child list without validating its upper bound, then dereferences the returned entry. Exploitation requires MP4Box to inspect an attacker-supplied file; the demonstrated result is a crash, while the CVE record also identifies arbitrary code execution.

CVSS severity7.8
High
EPSS probability1.13%
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 MP4Box in GPAC 1.0.1 allows attackers to execute arbitrary code via a crafted MP4 file. gf_isom_dovi_config_get uses DescriptionIndex minus one to access the sample-description child list without validating its upper bound, then dereferences the returned entry. Exploitation requires MP4Box to inspect an attacker-supplied file; the demonstrated result is a crash, while the CVE record also identifies arbitrary code execution.

The record

CVE
CVE-2021-36417
Published
Jan 12, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-787Out-of-bounds Write
T1204.002Malicious File

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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