CVE-2020-23109Public exploitNetwork attack vector

Memory disclosure and crash via out-of-bounds read

Published Nov 3, 2021 · Updated Aug 4, 2024

Buffer overflow in libheif 1.6.2 allows attackers to disclose memory or crash an image-processing application via a crafted HEIF file. Op_YCbCr420_to_RRGGBBaa::convert_colorspace reads two bytes beyond an allocated heap plane while converting the malformed image. A user or application must decode the file; exploitation can expose adjacent heap data or abort the process.

CVSS severity8.1
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in libheif 1.6.2 allows attackers to disclose memory or crash an image-processing application via a crafted HEIF file. Op_YCbCr420_to_RRGGBBaa::convert_colorspace reads two bytes beyond an allocated heap plane while converting the malformed image. A user or application must decode the file; exploitation can expose adjacent heap data or abort the process.

The record

CVE
CVE-2020-23109
Published
Nov 3, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 3, 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

8.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/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 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 exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application 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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