CVE-2020-22049Network attack vector

Service interruption via WTV header memory leak

Published Jun 2, 2021 · Updated Aug 4, 2024

Memory leak in FFmpeg 4.2's WTV demuxer allows attackers to exhaust process memory and interrupt media processing with a crafted WTV file. During failed WTV header parsing, read_header returns after parse_chunks errors without calling wtvfile_close on the file context opened by wtvfile_open_sector. Processing an attacker-supplied WTV file is required; each failed parse leaves memory allocated, enabling a service interrupt through resource exhaustion.

CVSS severity6.5
Medium
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in FFmpeg 4.2's WTV demuxer allows attackers to exhaust process memory and interrupt media processing with a crafted WTV file. During failed WTV header parsing, read_header returns after parse_chunks errors without calling wtvfile_close on the file context opened by wtvfile_open_sector. Processing an attacker-supplied WTV file is required; each failed parse leaves memory allocated, enabling a service interrupt through resource exhaustion.

The record

CVE
CVE-2020-22049
Published
Jun 2, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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