CVE-2021-40944Public exploit

Application crash via premature filter processing

Published Jun 28, 2022 · Updated Aug 4, 2024

Null pointer dereference in GPAC MP4Box 1.1.0 allows local users to crash the application by invoking an incomplete NHML filter graph. The filter loader schedules an NHML demuxer as a source when its argument text contains src even though the filter lacks a source argument, allowing processing to reach gf_filter_pid_get_packet without a connected input PID. Execution requires a local user to launch GPAC with the malformed filter specification; the resulting null read terminates that process without reported data disclosure or modification.

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

Null pointer dereference in GPAC MP4Box 1.1.0 allows local users to crash the application by invoking an incomplete NHML filter graph. The filter loader schedules an NHML demuxer as a source when its argument text contains src even though the filter lacks a source argument, allowing processing to reach gf_filter_pid_get_packet without a connected input PID. Execution requires a local user to launch GPAC with the malformed filter specification; the resulting null read terminates that process without reported data disclosure or modification.

The record

CVE
CVE-2021-40944
Published
Jun 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS: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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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