CVE-2020-22046Public exploitNetwork attack vector

Service interruption via failed AC-3 encoder initialization

Published Jun 2, 2021 · Updated Aug 4, 2024

Memory leak in FFmpeg 4.2 allows remote attackers to interrupt service through crafted media processed by the AC-3 encoder. During ff_ac3_encode_init, validate_options can fail after DSP state allocation, but the error path returns without running init_fail cleanup. Processing the crafted input requires user interaction; repeated failed initialization consumes memory until the hosting process hangs or terminates.

CVSS severity6.5
Medium
EPSS probability1.02%
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 allows remote attackers to interrupt service through crafted media processed by the AC-3 encoder. During ff_ac3_encode_init, validate_options can fail after DSP state allocation, but the error path returns without running init_fail cleanup. Processing the crafted input requires user interaction; repeated failed initialization consumes memory until the hosting process hangs or terminates.

The record

CVE
CVE-2020-22046
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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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