Security readout for executives and security teams
Plain-English summary
This issue affects older Foxit Reader and PhantomPDF versions before 9.2. A crafted document or content path could cause excessive memory consumption, likely disrupting the application rather than directly stealing data. The public record does not provide a CVSS score, CWE, detailed attack path, or confirmed exploitation.
Executive priority
Treat this as a hygiene and availability issue, not an emergency breach signal. The right business action is to remove obsolete Foxit versions from the fleet and confirm users who handle external documents are covered.
Technical view
CVE-2018-21240 is described as memory consumption in Foxit Reader and PhantomPDF before 9.2 through an ArrayBuffer(0xfffffffe) call. The available sources indicate a resource-exhaustion condition, but do not document privilege impact, code execution, sandbox escape, or a vendor-specific remediation entry beyond the affected version boundary.
Likely exposure
Exposure is most likely on endpoints still running Foxit Reader or PhantomPDF before 9.2, especially where users open untrusted PDF files or web-delivered document content. The source bundle does not identify affected platforms, configurations, or enterprise deployment specifics.
Exploitation context
The source bundle does not show CISA KEV listing or any cited report of active exploitation. The described primitive is memory consumption, so the known impact is availability disruption, not confirmed compromise or data theft.
Researcher notes
The record is sparse: no CVSS vector, CWE, proof of active exploitation, or detailed vendor advisory text is present in the supplied bundle. Avoid expanding impact beyond memory consumption unless additional primary sources support it.
Mitigation direction
- Inventory Foxit Reader and PhantomPDF installations and identify versions before 9.2.
- Move affected installations off versions before 9.2 using Foxit-supported guidance.
- Prioritize systems handling untrusted PDFs, email attachments, or externally sourced documents.
- Review Foxit security bulletins for the exact supported upgrade path.
Validation and detection
- Confirm installed Foxit Reader and PhantomPDF versions on managed endpoints.
- Check whether any endpoint remains on a version earlier than 9.2.
- Verify vendor bulletin coverage before closing remediation tickets.
- Review helpdesk or EDR telemetry for repeated Foxit memory exhaustion crashes.
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-2018-21240 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://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.