CVE-2019-20205Public exploitNetwork attack vector

Image-conversion crash via oversized resize dimensions

Published Jan 1, 2020 · Updated Aug 5, 2024

Integer overflow in sixel_frame_resize in libsixel 1.8.4 allows attackers to crash image conversion through oversized dimensions. The function accepts user-controlled width and height values, and very large values produce an overflowing allocation request in frame.c. Triggering the failure requires processing attacker-influenced dimensions; the published proof demonstrates an allocation abort, not code execution.

CVSS severity8.8
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in sixel_frame_resize in libsixel 1.8.4 allows attackers to crash image conversion through oversized dimensions. The function accepts user-controlled width and height values, and very large values produce an overflowing allocation request in frame.c. Triggering the failure requires processing attacker-influenced dimensions; the published proof demonstrates an allocation abort, not code execution.

The record

CVE
CVE-2019-20205
Published
Jan 1, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 1, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application 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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