CVE-2020-13114Network attack vector

Denial of service via unbounded MakerNote subtags

Published May 21, 2020 · Updated Aug 4, 2024

Uncontrolled resource consumption in libexif before 0.6.22 allows attackers to consume excessive CPU via crafted Canon EXIF MakerNote data. The exif_mnote_data_canon_load function expands array-valued MakerNote entries into individual tags without limiting the cumulative decoded value count. Reachability requires an application to pass attacker-controlled EXIF data to the library, where excessive tag iteration delays image-processing work.

CVSS severity7.5
High
EPSS probability2.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in libexif before 0.6.22 allows attackers to consume excessive CPU via crafted Canon EXIF MakerNote data. The exif_mnote_data_canon_load function expands array-valued MakerNote entries into individual tags without limiting the cumulative decoded value count. Reachability requires an application to pass attacker-controlled EXIF data to the library, where excessive tag iteration delays image-processing work.

The record

CVE
CVE-2020-13114
Published
May 21, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2020CVE 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

7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

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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