Security readout for executives and security teams
Plain-English summary
CVE-2018-9966 is a remote code execution flaw in Foxit Reader 9.0.1.1049. A user must open a malicious PDF-like file or visit a malicious page. Successful exploitation could run attacker-controlled code with the same privileges as the user.
Executive priority
Prioritize remediation for endpoints that process external documents. This is an older vulnerability, but remote code execution in a document reader remains business-relevant if vulnerable versions persist.
Technical view
The flaw is in Foxit Reader handling of Calculate actions for TextBox objects. The issue is described as missing validation that an object exists before operations are performed on it, allowing code execution in the current process context.
Likely exposure
Exposure is most likely where Foxit Reader 9.0.1.1049 remains installed, especially on workstations handling external documents, email attachments, downloads, or web-delivered files.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires user interaction: opening a malicious file or visiting a malicious page.
Researcher notes
Evidence identifies Foxit Reader 9.0.1.1049 and object-lifetime validation failure in TextBox Calculate action handling. The bundle does not provide CVSS, CWE, fixed version details, or evidence of exploitation in the wild.
Mitigation direction
- Inventory endpoints for Foxit Reader 9.0.1.1049.
- Review Foxit security bulletins for fixed versions and vendor guidance.
- Update or remove vulnerable Foxit Reader installations.
- Limit handling of untrusted PDF files until remediation is complete.
- Use least-privilege user accounts for document-handling workstations.
Validation and detection
- Confirm installed Foxit Reader versions across managed endpoints.
- Check whether Foxit Reader 9.0.1.1049 is present.
- Verify remediation against Foxit's security bulletin guidance.
- Review endpoint telemetry for suspicious Foxit Reader child processes.
- Confirm users cannot automatically open untrusted documents in Foxit Reader.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-9966 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
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://www.foxitsoftware.com/support/security-bulletins.phpCVE reference · x_refsource_CONFIRM
- https://zerodayinitiative.com/advisories/ZDI-18-350CVE 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.