Security readout for executives and security teams
Plain-English summary
This CVE describes a crash condition in SWFTools through 20201222. A malicious or malformed SWF input can trigger a NULL pointer dereference and cause denial of service. The public record does not provide a CVSS score, named patch, or confirmed exploitation.
Executive priority
Prioritize based on business reliance on SWFTools. If it processes untrusted files or supports critical services, treat this as an availability risk needing near-term review.
Technical view
The issue is a NULL pointer dereference in swf_GetBits() in rfxswf.c. The documented impact is denial of service. The source bundle identifies SWFTools through 20201222 but lists affected vendor/product metadata as unavailable.
Likely exposure
Exposure is most likely where SWFTools is installed and used to process SWF content, especially untrusted or externally supplied files. Source metadata does not identify specific distributions, packages, or deployment models.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The described attacker outcome is causing denial of service, not code execution or data theft.
Researcher notes
Evidence is limited to the CVE description and a GitHub issue reference. No CVSS vector, CWE mapping, patch commit, proof of active exploitation, or detailed affected package list is provided in the source bundle.
Mitigation direction
- Identify systems using SWFTools through 20201222.
- Avoid processing untrusted SWF files with affected SWFTools.
- Run SWFTools processing in isolated, resource-limited environments.
- Check upstream issue tracker or vendor guidance for fixes.
- Consider replacement if SWFTools is unsupported in your environment.
Validation and detection
- Inventory installed SWFTools versions and build dates.
- Review workflows that process SWF files with SWFTools.
- Check whether SWF processing touches business-critical services.
- Review logs for repeated SWFTools crashes or service interruptions.
- Confirm whether upstream has published remediation guidance.
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-2021-42198 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/168CVE 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.