Security readout for executives and security teams
This is an old document-handling flaw in JustSystems Ichitaro and Ichitaro Viewer. A malicious RTF file could trigger memory corruption and allow code execution in the user’s context. Business risk is mainly legacy Japanese office environments still opening untrusted RTF files with affected software. Exposure is likely limited to systems retaining affected JustSystems Ichitaro or Viewer versions, especially where users receive and open RTF attachments or downloaded documents. The source bundle does not enumerate all “other versions,” so inventory should not rely only on the named versions. Prioritize remediation where affected software remains in active use. The issue enables user-context code execution from a document, but available evidence does not show current active exploitation. Risk is highest in organizations with legacy Ichitaro workflows and frequent external document exchange. Mitigation focus: Inventory Ichitaro and Ichitaro Viewer installations across endpoints.; Apply JustSystems, JVN, or IPA vendor guidance where available.; Remove or upgrade affected legacy versions where business use allows..
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
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Execution behavior lookup
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Open ATT&CK lookupCVE-2009-4737 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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
- ichitaro-rtf-bo(49739)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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