CVE-2020-18899Public exploitNetwork attack vector

Application crash via JP2 length underflow

Published Aug 19, 2021 · Updated Oct 15, 2024

Uncontrolled memory allocation in Exiv2 0.27 allows attackers to crash the application by processing a crafted JP2 file. In Jp2Image::printStructure, a sub-box length smaller than the box header underflows during subtraction and is passed to DataBuf as an enormous allocation size. Triggering the flaw requires the crafted file to be processed with JP2 structure output, and the demonstrated consequence is an out-of-memory application crash.

CVSS severity6.5
Medium
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled memory allocation in Exiv2 0.27 allows attackers to crash the application by processing a crafted JP2 file. In Jp2Image::printStructure, a sub-box length smaller than the box header underflows during subtraction and is passed to DataBuf as an enormous allocation size. Triggering the flaw requires the crafted file to be processed with JP2 structure output, and the demonstrated consequence is an out-of-memory application crash.

The record

CVE
CVE-2020-18899
Published
Aug 19, 2021
Updated
Oct 15, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/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 exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1204.002Malicious File

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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