CVE-2021-44342Public exploit

Application crash via out-of-bounds PNG scanline write

Published Feb 28, 2022 · Updated Aug 4, 2024

Heap-buffer overflow in ok-file-formats revision 203defd allows attackers to crash a consuming application via a crafted PNG file. The ok_png_transform_scanline function writes one byte immediately beyond a 4,096-byte heap allocation while decoding the malformed scanline. Exploitation requires the file to be opened by an application that embeds the library; the published reproducer demonstrates a segmentation fault and memory corruption, not code execution.

CVSS severity7.8
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in ok-file-formats revision 203defd allows attackers to crash a consuming application via a crafted PNG file. The ok_png_transform_scanline function writes one byte immediately beyond a 4,096-byte heap allocation while decoding the malformed scanline. Exploitation requires the file to be opened by an application that embeds the library; the published reproducer demonstrates a segmentation fault and memory corruption, not code execution.

The record

CVE
CVE-2021-44342
Published
Feb 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2022CVE 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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