CVE-2021-28300

CRITICAL

NULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malic...

Affects 1 product across 1 vendor.

CVSS 3.19.8
EPSS2.1%
Percentile81th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-476: NULL Pointer Dereference

Software attempts to use a NULL pointer, causing a crash and denial of service.

◆ AI Analysis — automated analysis, not human-reviewed

A NULL Pointer Dereference vulnerability in the MergeTrack() function of GPAC v0.5.2 can be exploited by attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malicious MP4 file.

BSID: BS-2021-GLOBAL-079678-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-28300?
A NULL Pointer Dereference vulnerability in the MergeTrack() function of GPAC v0.5.2 can be exploited by attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malicious MP4 file.
What is the CVSS score for CVE-2021-28300?
CVE-2021-28300 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.1%.
Is CVE-2021-28300 actively exploited?
No confirmed active exploitation of CVE-2021-28300 as of 2026-05-30.
How do I remediate CVE-2021-28300?
Priority: IMMEDIATE.
What systems are affected by CVE-2021-28300?
CVE-2021-28300 affects Gpac Gpac.
Vulnerability Details
CVE IDCVE-2021-28300
BSIDBS-2021-GLOBAL-079678-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2021-04-14
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
NULL Pointer Dereference
SourceNVD
Official Description

NULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malicious MP4 file.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability exists in the isomedia/track.c module's MergeTrack() function of GPAC v0.5.2. Attackers can exploit this by crafting a specially designed MP4 file that triggers a NULL pointer dereference, leading to arbitrary code execution or a DoS condition.

Exploitation Likelihood: CRITICAL

Affected Products
VendorProductAffected Versions
Gpac Gpac 0.5.2
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2010 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hash8d1339598c13e90bc235608fcbdf4dbb5766df61a02a5a17959f053c0979389557c029fc3f3fd6abfb28f4d58266ca23cbe84c8ada8634c779eeabc6db04e32e
Related CVEs affecting Gpac
CVE-2022-1795 9.8 Use After Free in GitHub repository gpac/gpac prior to v2.1.0-DEV. CVE-2018-13006 9.8 An issue was discovered in MP4Box in GPAC 0.7.1. There is a heap-based buffer... CVE-2018-13005 9.8 An issue was discovered in MP4Box in GPAC 0.7.1. The function urn_Read in iso... CVE-2020-11558 9.8 An issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box... CVE-2022-36190 9.8 GPAC mp4box 2.1-DEV-revUNKNOWN-master has a use-after-free vulnerability in f...
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