Security readout for executives and security teams
Plain-English summary
CVE-2021-39597 is a denial-of-service issue in swftools through 20200710. If attacker-controlled input reaches the affected code path, the tool can crash. The public record does not provide CVSS, a vendor advisory, or a named fixed version.
Executive priority
Treat this as a targeted availability risk, not a confirmed breach risk. Prioritize if swftools supports customer-facing uploads, automated file processing, or operational workflows where crashes create business interruption.
Technical view
The CVE describes a NULL pointer dereference in code_dump2() in code.c within swftools through 20200710. The stated impact is denial of service. Public metadata does not identify CWE, CPEs, detailed affected products, or patch information.
Likely exposure
Exposure is most likely where swftools is installed in batch processing, file conversion, malware analysis, or legacy SWF handling workflows that accept untrusted files. Internet exposure is not established by the sources.
Exploitation context
The source bundle does not state active exploitation, and KEV is false. The plausible abuse case is crashing a process that invokes vulnerable swftools functionality, causing job failure or service disruption.
Researcher notes
The record is sparse: no CVSS, CWE, CPE, or fix is supplied. Avoid expanding affected scope beyond swftools through 20200710. Any deeper assessment should start from the referenced GitHub issue and local code/version validation.
Mitigation direction
- Inventory systems and pipelines using swftools through 20200710.
- Check upstream project guidance for a fixed release or patch status.
- Restrict swftools processing to trusted inputs where feasible.
- Sandbox or isolate file-processing jobs that invoke swftools.
- Add job supervision so crashes do not halt broader workflows.
Validation and detection
- Search build images, hosts, and repositories for swftools installations.
- Confirm installed swftools versions against the CVE scope.
- Identify whether swftools processes user-supplied or third-party files.
- Review crash handling around automated swftools jobs.
- Monitor vendor or project references for remediation updates.
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-2021-39597 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/143CVE 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.