Security readout for executives and security teams
Plain-English summary
CVE-2018-9959 is a remote code execution issue in Foxit Reader 9.0.1.1049. An attacker would need a user to open a malicious file or visit a malicious page. Successful exploitation could run code as the current user, making exposed endpoints a priority for upgrade or removal.
Executive priority
Treat this as a high-priority endpoint software risk where Foxit Reader 9.0.1.1049 remains installed. The business urgency is driven by possible code execution after normal user document-handling behavior, not by confirmed active exploitation in the supplied sources.
Technical view
The flaw is in Foxit Reader parsing of the pageNum document attribute. The source describes missing validation of an object before operations are performed, mapped to CWE-416. ZDI tracked it as ZDI-CAN-5432 and ZDI-18-343. Impact is arbitrary code execution in the current process context.
Likely exposure
Exposure is likely limited to endpoints running Foxit Reader 9.0.1.1049, especially users who open external PDFs or browse untrusted content. The source bundle does not prove broader Foxit product or version exposure.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV. Exploitation requires user interaction: the target must visit a malicious page or open a malicious file.
Researcher notes
Focus validation on exact product/version exposure and advisory mapping. The root issue is unsafe pageNum attribute parsing with object validation failure. Do not assume exploit availability, patched versions, or additional affected products beyond the supplied references.
Mitigation direction
- Inventory endpoints for Foxit Reader 9.0.1.1049.
- Check Foxit security bulletins for the vendor-approved update or mitigation.
- Upgrade or remove affected Foxit Reader installations following vendor guidance.
- Reduce user exposure to untrusted PDFs and unsolicited links.
Validation and detection
- Confirm installed Foxit Reader versions across managed endpoints.
- Verify no system remains on Foxit Reader 9.0.1.1049.
- Review Foxit advisory coverage for the deployed version.
- Check security tools for alerts involving malicious PDF delivery.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2018-9959 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://zerodayinitiative.com/advisories/ZDI-18-343CVE reference · x_refsource_MISC
- https://www.foxitsoftware.com/support/security-bulletins.phpCVE reference · x_refsource_CONFIRM
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.