CVE-2021-21848

HIGH

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The library will actually reuse the parser for ...

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-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

CWE-680: CWE-680
Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119 CWE-680
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119 CWE-680
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119 CWE-680
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119 CWE-680
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119 CWE-680
Show all 14

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, potentially allowing for arbitrary code execution.

BSID: BS-2021-GLOBAL-241419-H • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-21848?
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, potentially allowing for arbitrary code execution.
What is the CVSS score for CVE-2021-21848?
CVE-2021-21848 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-2021-21848 actively exploited?
No confirmed active exploitation of CVE-2021-21848 as of 2026-05-30.
How do I remediate CVE-2021-21848?
Priority: IMMEDIATE.
What systems are affected by CVE-2021-21848?
CVE-2021-21848 affects Debian Debian Linux; Gpac Gpac.
Vulnerability Details
CVE IDCVE-2021-21848
BSIDBS-2021-GLOBAL-241419-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 Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory BufferCWE-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. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and can cause an integer overflow 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 arises from the library reusing the parser for atoms with the 'stsz' FOURCC code when parsing atoms that use the 'stz2' FOURCC code, without proper bounds checking, leading to unchecked arithmetic and an integer overflow.

Exploitation Likelihood: HIGH

Affected Products
VendorProductAffected Versions
Debian Debian Linux 10.0 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 Hash84d11d72d19a21df8290f9e501baacc41aa1cac2956c23c74196045fd74e65c1e8deb81d7ccab84365e109df42dc02fda0ebc645bb9afbd2435b284761ec8d67
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