CVE-2021-21850

HIGH

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input can cause an i...

Affects 2 products across 2 vendors.

CVSS 3.18.8
EPSS1.7%
Percentile77th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, requires user interaction, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-190: Integer Overflow or Wraparound

Arithmetic operation exceeds the maximum integer value, wrapping around and often leading to undersized allocations.

CWE-680: CWE-680
Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-680
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-680
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-680
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-680
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-680
Show all 11

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

An integer overflow vulnerability in the MPEG-4 decoding functionality of the GPAC Project's Advanced Content library v1.0.1 can lead to a heap-based buffer overflow and memory corruption, potentially allowing an attacker to execute arbitrary code.

BSID: BS-2021-GLOBAL-241421-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-21850?
An integer overflow vulnerability in the MPEG-4 decoding functionality of the GPAC Project's Advanced Content library v1.0.1 can lead to a heap-based buffer overflow and memory corruption, potentially allowing an attacker to execute arbitrary code.
What is the CVSS score for CVE-2021-21850?
CVE-2021-21850 has CVSS 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS: 1.7%.
Is CVE-2021-21850 actively exploited?
No confirmed active exploitation of CVE-2021-21850 as of 2026-05-30.
How do I remediate CVE-2021-21850?
Priority: IMMEDIATE.
What systems are affected by CVE-2021-21850?
CVE-2021-21850 affects Debian Debian Linux; Gpac Gpac.
Vulnerability Details
CVE IDCVE-2021-21850
BSIDBS-2021-GLOBAL-241421-H BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published2021-08-25
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
Integer Overflow or WraparoundCWE-680
SourceNVD
Official Description

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input can cause an integer overflow when the library encounters an atom using the “trun” FOURCC code due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is triggered by a specially crafted MPEG-4 input file that contains an atom with the 'trun' FOURCC code. The issue arises from unchecked arithmetic during the parsing of this atom, leading to an integer overflow.

Exploitation Likelihood: HIGH

Affected Products
VendorProductAffected Versions
Debian Debian Linux 11.0
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: 1877 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 Hashc20cfc2b60533489c880bee9b89de756704085e66496ed8f50b04d3a7e3c21cabd3d432ed1f588170c4b84a42637cfaff17e1a2b31c2fdaf792f80a4085bc6e8
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