Security readout for executives and security teams
Plain-English summary
CVE-2018-9935 is a remote code execution flaw in Foxit Reader 8.3.2.25013. An attacker would need the user to open a malicious file or visit a malicious page. Successful exploitation could run code with the user’s privileges, making exposed legacy desktop installs the main business concern.
Executive priority
Treat this as a high-priority legacy endpoint cleanup issue. The vulnerability can lead to code execution, but exploitation requires user interaction and no active exploitation evidence is provided. Focus on finding and upgrading or removing affected Foxit Reader installations.
Technical view
The flaw is in Foxit Reader’s addField method. The source describes missing validation that an object exists before operations are performed on it, mapped to CWE-416. The reported impact is arbitrary code execution in the current process context. CVSS and fixed-version details are not included in the provided bundle.
Likely exposure
Exposure is limited to systems running Foxit Reader 8.3.2.25013, especially endpoints that open PDFs from email, web downloads, or external partners. The bundle does not identify other affected Foxit products or versions.
Exploitation context
The source states remote attackers can exploit vulnerable installations, but user interaction is required. The target must open a malicious file or visit a malicious page. The CVE is not listed as KEV in the provided data, so active exploitation is not established here.
Researcher notes
ZDI assigned this as ZDI-18-319 and describes the vulnerable method as addField. The bundle provides affected version and impact but lacks CVSS, exploit maturity, and fixed-version detail. Avoid expanding scope beyond Foxit Reader 8.3.2.25013 without additional vendor evidence.
Mitigation direction
- Inventory endpoints for Foxit Reader 8.3.2.25013.
- Check Foxit security bulletins for vendor-confirmed fixed versions and upgrade guidance.
- Prioritize upgrading or removing unsupported legacy Foxit Reader installations.
- Reduce user exposure to untrusted PDFs and suspicious links.
- Use endpoint controls to limit risky document-reader execution where practical.
Validation and detection
- Confirm whether Foxit Reader 8.3.2.25013 exists in software inventory.
- Verify upgraded endpoints no longer report the affected version.
- Review vulnerability scanner results for CVE-2018-9935 coverage.
- Check endpoint telemetry for unexpected Foxit Reader child processes or crashes.
- Document remediation status for users handling external PDF content.
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-2018-9935 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-18-319CVE 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.