AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-21839

HIGH · CVSS 8.8 EPSS 2.01% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-08-18 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 8.8. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-21839
Severity
HIGH
CVSS
8.8
EPSS
2.01%

Original NVD Description

Multiple exploitable integer overflow vulnerabilities exist 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 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)