CVE-2020-36407Network attack vector

Memory corruption via oversized image-grid dimensions

Published Jul 1, 2021 · Updated Aug 4, 2024

Out-of-bounds write in libavif 0.8.0 and 0.8.1 allows remote attackers to corrupt memory by supplying a crafted AVIF image. avifParseImageGridBox accepts untrusted output dimensions without limiting their product, allowing integer overflow before avifDecoderDataFillImageGrid writes decoded grid pixels. Processing requires user interaction in the consuming application, and the write corrupts adjacent memory with no authentication required.

CVSS severity8.8
High
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in libavif 0.8.0 and 0.8.1 allows remote attackers to corrupt memory by supplying a crafted AVIF image. avifParseImageGridBox accepts untrusted output dimensions without limiting their product, allowing integer overflow before avifDecoderDataFillImageGrid writes decoded grid pixels. Processing requires user interaction in the consuming application, and the write corrupts adjacent memory with no authentication required.

The record

CVE
CVE-2020-36407
Published
Jul 1, 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. Jul 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

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

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
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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