Is CVE-2020-21066 actively exploited?

No active exploitation of CVE-2020-21066 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-21066 be exploited remotely?

Yes. CVE-2020-21066 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-21066?

CVE-2020-21066 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2020-21066

CWE-787Published: August 13, 2021· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official Description

An issue was discovered in Bento4 v1.5.1.0. There is a heap-buffer-overflow in AP4_Dec3Atom::AP4_Dec3Atom at Ap4Dec3Atom.cpp, leading to a denial of service (program crash), as demonstrated by mp42aac.

NVD Source

Technical Analysis

CVE-2020-21066 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.