CVE-2021-44591

Denial of service via missing boundary check

Published Jan 6, 2022 · Updated Aug 4, 2024

Denial of service in libming 0.4.8 allows attackers to interrupt processing via a crafted SWF file. The parseSWF_DEFINELOSSLESS2 function in util/parser.c parses compressed lossless-image data without checking input boundaries, so malformed SWF fields can drive out-of-bounds processing. Exploitation requires delivery of a crafted SWF to a process that uses libming; the documented consequence is service interruption rather than data disclosure or code execution.

CVSS severityUnavailable
Unscored
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in libming 0.4.8 allows attackers to interrupt processing via a crafted SWF file. The parseSWF_DEFINELOSSLESS2 function in util/parser.c parses compressed lossless-image data without checking input boundaries, so malformed SWF fields can drive out-of-bounds processing. Exploitation requires delivery of a crafted SWF to a process that uses libming; the documented consequence is service interruption rather than data disclosure or code execution.

The record

CVE
CVE-2021-44591
Published
Jan 6, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 6, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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