CVE-2020-22016Network attack vector

Memory corruption via unpadded MOV track extradata

Published May 27, 2021 · Updated Aug 4, 2024

Heap-based buffer overflow in FFmpeg 4.2 allows attackers to corrupt memory when crafted codec data is written to a MOV file. In libavformat/movenc.c, MOV-writing paths copied codec extradata into exactly sized track buffers without the zero padding required by bit readers, allowing access beyond the allocation. Exploitation requires a user or application to process attacker-controlled media into MOV output; the demonstrated consequence is a crash, while further impact is unspecified.

CVSS severity8.8
High
EPSS probability1.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in FFmpeg 4.2 allows attackers to corrupt memory when crafted codec data is written to a MOV file. In libavformat/movenc.c, MOV-writing paths copied codec extradata into exactly sized track buffers without the zero padding required by bit readers, allowing access beyond the allocation. Exploitation requires a user or application to process attacker-controlled media into MOV output; the demonstrated consequence is a crash, while further impact is unspecified.

The record

CVE
CVE-2020-22016
Published
May 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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