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CVE Record

CVE-2021-39582: An issue was discovered in swftools through 20200710.

An issue was discovered in swftools through 20200710. A heap-buffer-overflow exists in the function swf_GetPlaceObject() located in swfobject.c. It allows an attacker to cause code Execution.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-39582 is a memory-safety flaw in swftools through 20200710. If a system processes a malicious SWF file with the vulnerable code path, the issue is reported to allow code execution. The public record does not provide CVSS scoring, confirmed affected package metadata, or a named patch.

Executive priority

Prioritize if the organization processes SWF files from external or untrusted sources. Treat internet-facing upload or conversion workflows as urgent. If swftools is unused or isolated, handle through normal vulnerable software cleanup.

Technical view

The CVE describes a heap-buffer-overflow in swf_GetPlaceObject() in swfobject.c. The vulnerable component is swftools through 20200710. The record states that the issue can allow code execution, but the supplied sources do not include CVSS, CWE, exploit status, or remediation details.

Likely exposure

Exposure is most likely where swftools is installed and used to parse, inspect, convert, or batch-process SWF content, especially user-supplied or internet-sourced files. Business risk is lower where SWF processing is absent or fully isolated.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. The referenced GitHub issue is public, but this analysis does not rely on exploit details beyond the CVE description.

Researcher notes

The public data is sparse: no CVSS vector, CWE classification, vendor/product CPE, or explicit fix is provided in the bundle. The key confirmed details are swftools through 20200710, heap-buffer-overflow in swf_GetPlaceObject(), and stated code-execution impact.

Mitigation direction

  • Inventory hosts, containers, and build pipelines for swftools through 20200710.
  • Stop processing untrusted SWF files until vendor guidance or a fixed build is confirmed.
  • Run SWF conversion jobs in sandboxed, low-privilege environments.
  • Check the linked upstream issue and CVE record for remediation updates.
  • Remove swftools where Flash or SWF processing is no longer required.

Validation and detection

  • Search package manifests, container images, and installed binaries for swftools.
  • Confirm whether any workflow accepts user-supplied SWF files.
  • Identify automation that invokes swftools on email, upload, archive, or web content.
  • Review runtime isolation, filesystem access, and privileges for SWF processing jobs.
  • Track the CVE record and upstream issue for patch or version clarification.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-39582 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.