CVE-2020-20898Network attack vector

Process crash via Prewitt gradient integer overflow

Published Sep 20, 2021 · Updated Aug 4, 2024

Integer overflow in FFmpeg 4.2.1 libavfilter allows attackers to crash media processing through input that reaches the Prewitt filter. The filter16_prewitt function squares signed-integer gradient sums before passing the result to sqrtf, allowing the arithmetic to exceed the integer range and trigger undefined behavior. The flaw is reached when 16-bit video is processed with the Prewitt convolution filter; user interaction is required, and impacts beyond a process crash remain unspecified.

CVSS severity8.8
High
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in FFmpeg 4.2.1 libavfilter allows attackers to crash media processing through input that reaches the Prewitt filter. The filter16_prewitt function squares signed-integer gradient sums before passing the result to sqrtf, allowing the arithmetic to exceed the integer range and trigger undefined behavior. The flaw is reached when 16-bit video is processed with the Prewitt convolution filter; user interaction is required, and impacts beyond a process crash remain unspecified.

The record

CVE
CVE-2020-20898
Published
Sep 20, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 20, 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

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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