Security readout for executives and security teams
Plain-English summary
CVE-2021-39589 is a denial-of-service issue in swftools through 20200710. A malformed input can trigger a crash in metadata parsing. Business urgency depends on whether swftools processes untrusted Flash content in automated workflows; if it does, this could interrupt conversion or processing services.
Executive priority
Treat this as a targeted availability risk, not a confirmed breach indicator. Prioritize assessment if swftools supports production automation, customer uploads, or security-sensitive file processing. Otherwise, handle through routine vulnerability management and vendor tracking.
Technical view
The CVE describes a NULL pointer dereference in parse_metadata() in abc.c in swftools through 20200710. The stated impact is denial of service. The source bundle provides no CVSS score, CWE, CPE, confirmed fixed version, or vendor mitigation details.
Likely exposure
Exposure is most likely where swftools is installed and used to process SWF or related Flash content, especially files supplied by users or external parties. The affected metadata is incomplete, with vendor, product, versions, and CPE listed as n/a except for the textual swftools version range.
Exploitation context
The CVE and referenced GitHub issue describe a crash condition, not active exploitation. KEV status is false, and the provided sources do not claim exploitation in the wild or provide a confirmed exploit campaign.
Researcher notes
Evidence is sparse. The key technical claim is a NULL pointer dereference in parse_metadata() in abc.c causing denial of service. No CVSS, CWE, patch, affected CPE, proof of active exploitation, or detailed remediation is provided in the source bundle.
Mitigation direction
- Inventory servers, containers, and pipelines for swftools usage.
- Check upstream project guidance for fixed builds or recommended workarounds.
- Avoid processing untrusted Flash files with swftools until guidance is confirmed.
- Run required processing in isolated, resource-limited workers.
Validation and detection
- Confirm installed swftools versions against the reported range through 20200710.
- Identify whether swftools receives user-supplied or externally sourced files.
- Review crash logs for swftools failures during metadata parsing.
- Track the linked GitHub issue for maintainer updates or fixes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-39589 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/matthiaskramm/swftools/issues/132CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.