CVE-2019-20631Public exploit

Process crash via freed-list dereference in gf_list_count

Published Mar 24, 2020 · Updated Aug 5, 2024

Use-after-free in libgpac.a in GPAC before 0.8.0 allows local users to crash MP4Box by processing a crafted MP4 file. During MPEG-TS program-map processing, gf_m2ts_process_pmt passes a freed list pointer to gf_list_count, which dereferences it. A local user must cause MP4Box to inspect the file; the documented consequence is a process crash, with no demonstrated code execution.

CVSS severity5.5
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in libgpac.a in GPAC before 0.8.0 allows local users to crash MP4Box by processing a crafted MP4 file. During MPEG-TS program-map processing, gf_m2ts_process_pmt passes a freed list pointer to gf_list_count, which dereferences it. A local user must cause MP4Box to inspect the file; the documented consequence is a process crash, with no demonstrated code execution.

The record

CVE
CVE-2019-20631
Published
Mar 24, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-763, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 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-763Release of Invalid Pointer or Reference
T1499.004Application or System Exploitation
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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