CVE-2021-44590Public exploitNetwork attack vector

Application crash via unchecked SWF allocation

Published Jan 6, 2022 · Updated Aug 4, 2024

Memory exhaustion in libming 0.4.8 allows remote attackers to crash SWF-processing applications through a crafted compressed SWF file. The cws2fws function in util/main.c trusts the attacker-controlled uncompressed-size field and passes it directly to realloc without a bounds check. A user or application must process the file; the resulting oversized allocation failure terminates the affected process without reported data exposure or modification.

CVSS severity6.5
Medium
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in libming 0.4.8 allows remote attackers to crash SWF-processing applications through a crafted compressed SWF file. The cws2fws function in util/main.c trusts the attacker-controlled uncompressed-size field and passes it directly to realloc without a bounds check. A user or application must process the file; the resulting oversized allocation failure terminates the affected process without reported data exposure or modification.

The record

CVE
CVE-2021-44590
Published
Jan 6, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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