CVE-2021-40571

Denial of service via double-free in ilst_box_read

Published Jan 13, 2022 · Updated Aug 4, 2024

Double-free in MP4Box in Gpac 1.0.1 allows attackers to cause denial of service via a maliciously crafted MP4 file. The ilst_box_read function in box_code_apple.c releases the same heap allocation twice while processing an ilst box, corrupting allocator state. Exploitation requires a user or process to open attacker-controlled media locally; the resulting impact is a crash, with code execution or privilege escalation possible but not established.

CVSS severity6.8
Medium
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in MP4Box in Gpac 1.0.1 allows attackers to cause denial of service via a maliciously crafted MP4 file. The ilst_box_read function in box_code_apple.c releases the same heap allocation twice while processing an ilst box, corrupting allocator state. Exploitation requires a user or process to open attacker-controlled media locally; the resulting impact is a crash, with code execution or privilege escalation possible but not established.

The record

CVE
CVE-2021-40571
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 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

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1203Exploitation for Client Execution

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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