Security readout for executives and security teams
Plain-English summary
This CVE describes a crash in the Windows build of SWFTools 2013-04-09-1007. A malformed TTF font processed by font2swf can trigger an access violation, causing denial of service. The public record does not provide CVSS scoring, patch details, or evidence of active exploitation.
Executive priority
Treat this as a legacy-tool availability risk, not a confirmed breach vector. Prioritize if SWFTools is exposed to untrusted font files in automated publishing, conversion, or customer-upload workflows. Otherwise, track and retire or isolate the component during normal risk reduction.
Technical view
font2swf mishandles malformed TTF input, leading to an access violation described as faulting-address data controlling branch selection. The stated impact is denial of service only. The CVE source bundle lists affected vendor and product fields as n/a, but the description specifically names SWFTools 2013-04-09-1007 on Windows.
Likely exposure
Exposure is most likely where legacy Windows systems run SWFTools font2swf against user-supplied or externally sourced TTF files. Organizations not using SWFTools, font2swf, or TTF-to-SWF conversion workflows are unlikely to be affected based on the provided sources.
Exploitation context
The CVE says exploitation can be triggered by a malformed TTF file and results in denial of service. There is no KEV listing and no cited source in the bundle states active exploitation, public weaponization, privilege escalation, or code execution.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, patch, or detailed affected-product metadata is provided. The reliable facts are the named Windows SWFTools build, font2swf, malformed TTF trigger, access violation, and denial-of-service impact. Avoid expanding scope beyond those facts.
Mitigation direction
- Identify and restrict any SWFTools 2013-04-09-1007 Windows deployments.
- Avoid processing untrusted TTF files with font2swf until vendor guidance is confirmed.
- Run legacy conversion jobs in isolated, low-privilege environments.
- Check SWFTools and advisory sources for fixed builds or official workarounds.
Validation and detection
- Inventory Windows hosts and build pipelines for SWFTools and font2swf usage.
- Confirm whether version 2013-04-09-1007 is present.
- Map workflows that accept external TTF files before conversion.
- Review crash logs for font2swf access violations during font handling.
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-2017-8420 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/wlinzi/security_advisories/tree/master/CVE-2017-8420CVE 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.