CVE-2020-36279Network attack vector

Application crash via column-replication heap over-read

Published Mar 12, 2021 · Updated Aug 4, 2024

Out-of-bounds read in Leptonica before 1.80.0 allows remote attackers to crash image-processing applications via crafted image data. The pixFillMapHoles function repeatedly copies missing columns between an image and a temporary copy, causing rasteropGeneralLow to read beyond the heap buffer. Processing an image that exercises missing-column replication is required, and the documented consequence is an application crash.

CVSS severity7.5
High
EPSS probability2.57%
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 read in Leptonica before 1.80.0 allows remote attackers to crash image-processing applications via crafted image data. The pixFillMapHoles function repeatedly copies missing columns between an image and a temporary copy, causing rasteropGeneralLow to read beyond the heap buffer. Processing an image that exercises missing-column replication is required, and the documented consequence is an application crash.

The record

CVE
CVE-2020-36279
Published
Mar 12, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV:N/AC:L/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 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-125Out-of-bounds Read

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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