CVE-2020-22035Network attack vector

Memory corruption via undersized BM3D buffers

Published Jun 1, 2021 · Updated Aug 4, 2024

Heap-based buffer overflow in the BM3D filter in FFmpeg 4.2 allows remote attackers to corrupt memory via crafted video input. The filter_slice path permits negative block limits for undersized planes, while config_input allocates num and den buffers without block-size alignment, causing block processing to overrun heap storage. Exploitation requires a user or application to process attacker-controlled video with the BM3D filter; the published impact is bounded to memory corruption.

CVSS severity8.8
High
EPSS probability1.18%
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 the BM3D filter in FFmpeg 4.2 allows remote attackers to corrupt memory via crafted video input. The filter_slice path permits negative block limits for undersized planes, while config_input allocates num and den buffers without block-size alignment, causing block processing to overrun heap storage. Exploitation requires a user or application to process attacker-controlled video with the BM3D filter; the published impact is bounded to memory corruption.

The record

CVE
CVE-2020-22035
Published
Jun 1, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 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 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-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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