CVE-2021-40576

MEDIUM

The binary MP4Box in Gpac 1.0.1 has a null pointer dereference vulnerability in the gf_isom_get_payt_count function in hint_track.c, which allows attackers to cause a denial of service.

Affects 1 product across 1 vendor.

CVSS 3.15.5
EPSS0.9%
Percentile58th
PatchPatched
CVSS Vector — Plain English Requires local access, low complexity, no authentication required, requires user interaction, impact contained to the vulnerable component, no confidentiality impact, no 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 exists in the MP4Box binary of GPAC 1.0.1, specifically in the gf_isom_get_payt_count function within hint_track.c. This vulnerability can be exploited to cause a denial of service.

BSID: BS-2022-GLOBAL-307367-M • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2021-40576?
A null pointer dereference vulnerability exists in the MP4Box binary of GPAC 1.0.1, specifically in the gf_isom_get_payt_count function within hint_track.c. This vulnerability can be exploited to cause a denial of service.
What is the CVSS score for CVE-2021-40576?
CVE-2021-40576 has CVSS 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS: 0.9%.
Is CVE-2021-40576 actively exploited?
No confirmed active exploitation of CVE-2021-40576 as of 2026-05-30.
How do I remediate CVE-2021-40576?
Priority: MEDIUM.
What systems are affected by CVE-2021-40576?
CVE-2021-40576 affects Gpac Gpac.
Vulnerability Details
CVE IDCVE-2021-40576
BSIDBS-2022-GLOBAL-307367-M BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published2022-01-13
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
NULL Pointer Dereference
SourceNVD
Official Description

The binary MP4Box in Gpac 1.0.1 has a null pointer dereference vulnerability in the gf_isom_get_payt_count function in hint_track.c, which allows attackers to cause a denial of service.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is triggered by a specific sequence of operations that lead to a null pointer dereference in the gf_isom_get_payt_count function. An attacker can exploit this by crafting a malicious MP4 file that, when processed by MP4Box, results in a crash.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Gpac Gpac 1.0.1
Remediation

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

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 1736 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
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash4e71c8816f4e3b300ca607831952bed20df67449a09ea1eb1b39ce16c966a762315ebb70d88af618416642d86225563bc8f0b89d6b2580d291c3b9114bae2921
Related CVEs affecting Gpac
CVE-2021-28300 9.8 NULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" fu... 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-2022-1795 9.8 Use After Free in GitHub repository gpac/gpac prior to v2.1.0-DEV.
View all Gpac CVEs →

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