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No exploitation reportedFix available

CVE-2021-21839

No exploitation reported by the sources we read.

  • Published2021-08-18
  • WeaknessCWE-119 · CWE-680

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-08-1813:15CVE publishedNVD

Versions per branch

NVD
Gpac
BranchAffectedFixed in
1.0= 1.0.1no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
11.0= 11.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • gpacUbuntu:Pro:24.04:LTSall versions · no fixed version listed
  • gpacUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • gpacUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • gpacUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • gpacUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • gpacUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • gpacMageia:8all versions · fixed in 1.0.1-1.1.mga8.tainted
  • gpacDebian:11all versions · fixed in 1.0.1+dfsg1-4+deb11u1

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • CNACVSS 3.08.8known since 2026-10-23
  • NVDCVSS 2.06.8read 2026-10-23
  • CNAweakness (CWE)CWE-680known since 2026-10-23
  • NVDweakness (CWE)CWE-119read 2026-10-23
  • FIRST EPSSEPSS score2.0 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-08-18
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-j5x6-97r8-x29f

Frequently asked questions

What is CVE-2021-21839?

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.

Is CVE-2021-21839 actively exploited?

Active exploitation of CVE-2021-21839 has not been confirmed. Its EPSS score was 2.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21839?

CVE-2021-21839 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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