Security readout for executives and security teams
Plain-English summary
CVE-2021-39555 is a denial-of-service issue in swftools through 20200710. A NULL pointer dereference can crash the affected code path, potentially interrupting systems that use swftools for file processing. The public record does not indicate data theft, code execution, a patch, or active exploitation.
Executive priority
Prioritize this for systems where swftools handles untrusted or business-critical file processing. It appears availability-focused, with no source evidence of data compromise or code execution, so urgency depends on operational reliance.
Technical view
The CVE record identifies a NULL pointer dereference in InfoOutputDev::type3D0() in InfoOutputDev.cc in swftools through 20200710. The documented impact is denial of service. No CVSS vector, CWE, fixed version, or detailed affected-platform matrix is provided in the supplied sources.
Likely exposure
Exposure is most likely where swftools through 20200710 is installed and used in automated or user-facing processing workflows. The bundle does not identify packaged downstream products, operating systems, or specific deployment patterns.
Exploitation context
The source bundle reports denial of service but does not cite active exploitation, KEV listing, public weaponization, or exploitation in the wild. Treat exploitability details as incomplete unless vendor or maintainer guidance adds more context.
Researcher notes
Evidence is limited to the CVE description and linked GitHub issue reference. Do not assume a fixed version, exploit maturity, or broader product impact from the supplied bundle alone. Additional maintainer or distribution advisories would improve confidence.
Mitigation direction
- Inventory swftools installations and determine whether versions are through 20200710.
- Check maintainer or distribution guidance for fixed packages or recommended workarounds.
- Avoid processing untrusted files with affected swftools workflows where feasible.
- Run file-processing jobs with isolation and restart controls to reduce outage impact.
Validation and detection
- Confirm whether swftools is present on servers, containers, CI jobs, or desktops.
- Record installed swftools versions and compare them with through-20200710 exposure.
- Review applications that call swftools on externally supplied content.
- Check logs and crash reports for recurring swftools process failures.
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-2021-39555 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/99CVE 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.