CVE-2021-34338Public exploitNetwork attack vector

Utility crash via incomplete SWF bounds check

Published Mar 7, 2022 · Updated Aug 4, 2024

Out-of-bounds access in the swftophp decompiler in LibMing Ming 0.4.8 allows context-dependent attackers to crash the utility. The getName() function in util/decompile.c applies an incomplete boundary check while decompiling a crafted SWF DELETE action, causing an invalid memory access and segmentation fault. Exploitation requires a user or application to pass the crafted SWF to swftophp; the demonstrated consequence is process termination, not code execution.

CVSS severity6.5
Medium
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the swftophp decompiler in LibMing Ming 0.4.8 allows context-dependent attackers to crash the utility. The getName() function in util/decompile.c applies an incomplete boundary check while decompiling a crafted SWF DELETE action, causing an invalid memory access and segmentation fault. Exploitation requires a user or application to pass the crafted SWF to swftophp; the demonstrated consequence is process termination, not code execution.

The record

CVE
CVE-2021-34338
Published
Mar 7, 2022
Updated
Aug 4, 2024
Vendor
Ming Development Team
Product
Ming
Classifications
CWE-787, CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Ming 0.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ming Development Team · Mingversion=Ming 0.4.8

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-125Out-of-bounds Read

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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